Citazione Stile APA (7a Edizione)

Nungesser, M., & Roloff, S. (2001). When 6 is 9: By Stefan Roloff.

Citazione stile Chigago Style (17a edizione)

Nungesser, Michael, e Stefan Roloff. When 6 Is 9: By Stefan Roloff. Berlin, 2001.

Citatione MLA (8a ed.)

Nungesser, Michael, e Stefan Roloff. When 6 Is 9: By Stefan Roloff. 2001.