Παραπομπή σε μορφή APA (7η εκδ.)

Sawyers, J., & Williams, L. F. (1989). Difficult problems in general surgery. Year Book Medical Publishers.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Sawyers, John, και Lester F. Williams. Difficult Problems in General Surgery. Chicago: Year Book Medical Publishers, 1989.

Παραπομπή σε μορφή MLA (8th εκδ.)

Sawyers, John, και Lester F. Williams. Difficult Problems in General Surgery. Year Book Medical Publishers, 1989.