Cita APA (7a ed.)

Degn, C., Eggert, E., & Kolb, A. (1970). Europa. Hirt.

Cita Chicago Style (17a ed.)

Degn, Christian, Erwin Eggert, y Albert Kolb. Europa. Kiel: Hirt, 1970.

Cita MLA (9a ed.)

Degn, Christian, et al. Europa. Hirt, 1970.