Gaya APA

Polubarinova-Kochina, P., Ludwick, P. (1957). Men of Russian Science: Sophia Vasilyevna Kovalevskaya . Moscow: Foreign Languages Publishing House - Moscow.

Gaya MLA

Polubarinova-Kochina, P.., Ludwick, P.. "Men of Russian Science: Sophia Vasilyevna Kovalevskaya". Moscow: Foreign Languages Publishing House - Moscow, 1957. Koleksi Elektronik.