MLA

Armstrong, Terence E. Yermak's Campaign In Siberia : a Selection of Documents. London: Hakluyt Society, 1975.

APA

Armstrong, T. E. (1975). Yermak's campaign in Siberia : a selection of documents. London: Hakluyt Society.

Chicago

Armstrong, Terence E. Yermak's Campaign In Siberia: A Selection of Documents. London: Hakluyt Society, 1975.