The references and resources for this subject are numerous and many can be found on the internet today. The following are a few of the resources reviewed on the subject of the Cimmerians and Scythians.
[Note: Some historians offer two general explanations relating the Cimmerians and Scythians to the people of ancient Israel. These explanations are based on the use of a biblical premise and the use of a presumptive historical premise based on British-Israelism. With the biblical premise being sufficient to prove the current existence of the twelve tribes it is incongruous to use a presumptive conclusion identifying the United States and Britain with the tribes of Manasseh and Ephraim respectively. Using a conclusion as a premise formulates circular reasoning and unsupported conclusions.] 
(Cimmerians, Scythians and the “Lost” Tribes of Israel–Part One)
Some reviewed resources:
Compendium of World History, Volume One, by Dr. Herman L. Hoeh., 1967: “After the Trojan War the region of Phrygia was utterly devastated by Cimmerians—Greek for people of Gomer,” p. 250.
The New International Standard Bible Encyclopedia, Vol. 1, “Cimmerians,” Vol. 4 “Scythians” and “Table of Nations.”
The Early Empires of Central Asia, by William McGovern, 1939.
The Historians History of the World, by Henry Smith Williams, Vol. 1., 1907.
History of Assyria, by A. T. Olmstead, 1960.
The Making of the Russian Nation, by Henryk Paszkiewicz, 1977.
Ancient Russia, by George Vernadsky, 1943, 1952.
A History of Russia, by George Vernadsky, 1929, 1949.
Readings in Russian History, by Warren B. Walsh, 3rd Ed., 1959.
The Origin of Russia, by Henryk Paszkiewicz, 1954.
Scythians and Greeks, A Survey of Ancient History and Archaeology on the North Coast of the Euxine from the Danube to the Caucasus, by Ellis H. Minns.
The Slavs, A Cultural and Historical Survey of the Slavonic Peoples, by Roger Portal, 1969.
A History of Russia, by Bernard Pares, 1956.; The Armenians, by Sirarpie Den Nersessian, 1970.
Anthropology 92/93, Annual Editions, “The Mother Tongue,” 1992, (U.S. News and World Report, November, 5, 1990.)
The Story of Language, by Mario Pei, 1949.
The United States and Britain in Prophecy, by Herbert Armstrong, 1980.
The Road to Nineveh, The Adventures and Excavations of Sir Austen Henry Layard, by Nora Benjamin Kubie, 1964.
A History of the Ancient World, by Chester G. Starr, 1983.
The Origins of History, by Herbert Butterfield, 1981.
Key to Northwest European Origins, by Raymond McNair, 1963.
Who Were the Cimmerians and Where Did They Come From?: Sargon II, the Cimmerians, and Rusa I, Ann Katrine Gade Kristensen, 1988.
The Dawn of Modern Geography, a History of Exploration and Geographical Science, by Sir Charles Raymond Beazley, 1906.
Some reviewed internet resources:
“The Evolution of the Indo-European Language,” by Dr. C. George Boeree.
Archaeology Wordsmith, “Cimmerians.”
“The Current State of the Cimmerian Problem, Ancient Civilizations from Scythia to Serbia,” academia. edu.
“Classical Records and German Origins,” by William Finck.
“Ptolemy’s Orini and our Countrymen Goranies,” by Prof. D. Sc. Miodrag Stojanovic.
“Classical Records of the Origins of the Scythians, Parthians and Related Tribes,” by William Finck, Jr. 2006.
“Cimmerians,” archaeology wordsmith.
“Gog and Magog, Locating Magog,” hashem1.net.
“A Dissertation on the Origin and Progress of the Scythians or Goths: Being an Introduction to the Ancient and Modern History of Europe”, by John Pinkerton, 1787, google.com.
“Assyrians,” enclyclopedia.com.
“Israel, the ‘House of Omri,’” ucl.ac.uk/sargon.
“The Inscription of Sargon II at Tang-I Var, by Grant Frame, ucl.ac.uk.
“The Scythians,” cais-soas.com.
