Cita APA

Ludolph, P. E. (1970). Geography of the USSR (2a. ed.). New York: Wiley.

Citación estilo Chicago

Ludolph, Paul E. Geography of the USSR. 2a. ed. New York: Wiley, 1970.

Cita MLA

Ludolph, Paul E. Geography of the USSR. 2a. ed. New York: Wiley, 1970.