Παραπομπή APA

W P Crawford. (1991). Proceedings 39th annual pfizer research conference may 13, 1991. Newyork.

Παραπομπή Chicago Style

W P Crawford. Proceedings 39th Annual Pfizer Research Conference May 13, 1991. Newyork, 1991.

Παραπομπή MLA

W P Crawford. Proceedings 39th Annual Pfizer Research Conference May 13, 1991. Newyork, 1991.