Cita APA (7a ed.)

Beckhard, A. J., & Beck, C. (1959). Albert Einstein. G.P. Putnam's Sons.

Cita Chicago Style (17a ed.)

Beckhard, Arthur J., y Charles Beck. Albert Einstein. New York: G.P. Putnam's Sons, 1959.

Cita MLA (9a ed.)

Beckhard, Arthur J., y Charles Beck. Albert Einstein. G.P. Putnam's Sons, 1959.