M. Sprengling. Tonyukuk’s Epitaph: An Old Turkish Masterpiece Introduction, Text, Annotated Scientific Translation, Literary Translation and Transliteration (1939)
Joo–Yup Lee. The Historical Meaning of the Term Turk and the Nature of the Turkic Identity of the Chinggisid and Timurid Elites in Post–Mongol Central Asia (2016)
Karl H. Menges. Research in the Turkic Dialects of Iran: Preliminary Report on a Trip to Persia (1951)