Cita APA (7a ed.)

Wessling, B., Mahler, A., & Stadtlander, K. Alma / Berndt W. Wessling.

Cita Chicago Style (17a ed.)

Wessling, Berndt, Alma Mahler, y Karin Stadtlander. Alma / Berndt W. Wessling. [España.

Cita MLA (8a ed.)

Wessling, Berndt, et al. Alma / Berndt W. Wessling.