APA (7th ed.) Citation

Abel, B., Irle, M., Abel, B., & Irle, M. (1983). Marktpsychologie. Marktpsychologie.

Chicago Style (17th ed.) Citation

Abel, Bodo, Martin Irle, Bodo Abel, and Martin Irle. "Marktpsychologie." Marktpsychologie 1983.

MLA (8th ed.) Citation

Abel, Bodo, et al. "Marktpsychologie." Marktpsychologie, 1983.