MLA

Clair-Tisdall, William St. Clair. Key to the Modern Persian Conversation-grammar. 3d ed. Heidelberg: Julius Groos, 1923.

APA

Clair-Tisdall, W. St. Clair. (1923). Key to the Modern Persian conversation-grammar. 3d ed. Heidelberg: Julius Groos.

Chicago

Clair-Tisdall, William St. Clair, Key to the Modern Persian Conversation-Grammar. 3d ed. Heidelberg: Julius Groos, 1923.