Cita APA (7th ed.)

Garrels, G., & Drechsler, W. (1987). Cumulus. Parkett.

Cita Chicago (17th ed.)

Garrels, Gary, i Wolfgang Drechsler. "Cumulus." Parkett 1987.

Cita MLA (8th ed.)

Garrels, Gary, i Wolfgang Drechsler. "Cumulus." Parkett, 1987.