APA استشهاد

De Silva, P. (1992). Obsessive compulsive disorders: The facts. Oxford University.

استشهاد بنمط شيكاغو

De Silva, Padmal. Obsessive Compulsive Disorders: The Facts. Oxford: Oxford University, 1992.

MLA استشهاد

De Silva, Padmal. Obsessive Compulsive Disorders: The Facts. Oxford University, 1992.