Παραπομπή APA

Adamek, J., Herrlich, H., & Strecker, G. (1990). Abstract and concrete categories. John Wiley.

Παραπομπή Chicago Style

Adamek, Jiri, Horst Herrlich, και George Strecker. Abstract and Concrete Categories. New York: John Wiley, 1990.

Παραπομπή MLA

Adamek, Jiri, et al. Abstract and Concrete Categories. John Wiley, 1990.