APA (7th ed.) Citation

Kroll, S., Zimansky, P., Roaf, M., Hellwag, U., Gruber, C., Roaf, M., . . . Kroll, S. (2012). Introduction.

Chicago Style (17th ed.) Citation

Kroll, Stephan, Paul Zimansky, Michael Roaf, Ursula Hellwag, Claudia Gruber, M. Roaf, U. Hellwag, C. Gruber, and St Kroll. Introduction. 2012.

MLA (8th ed.) Citation

Kroll, Stephan, et al. Introduction. 2012.