Παραπομπή APA

Nayfeh, . A. (1973). Perturbation methods. John Wiley and sons.

Παραπομπή Chicago Style

Nayfeh, A.H. Perturbation Methods. New York: John Wiley and sons, 1973.

Παραπομπή MLA

Nayfeh, A.H. Perturbation Methods. John Wiley and sons, 1973.