Cita APA (7th ed.)

Petri, B., Wagner, E., & Wilhelm, S. (1998). memo 38.

Cita Chicago (17th ed.)

Petri, Barbara, Ellen Wagner, i Susanne Wilhelm. Memo 38. Wiesbaden, 1998.

Cita MLA (8th ed.)

Petri, Barbara, et al. Memo 38. 1998.