Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.