APA
Volkov A,, . (1957). Earth and sky. Moscow: Foreign Lanaguage Publishing House.
Chicago
Volkov A,, . 1957. Earth and sky. Moscow: Foreign Lanaguage Publishing House.
Harvard
Volkov A,, . (1957). Earth and sky. Moscow: Foreign Lanaguage Publishing House.
MLA
Volkov A,, . Earth and sky. Moscow: Foreign Lanaguage Publishing House. 1957.