Dyfyniad APA

National Seminar on Petrochemicals Karachi, Pakistan, & Pakistan Institute of Chemical Engineers. (1981). National Seminar on Petrochemicals, April 12 & 13, 1981, Karachi. The Institute.

Dyfyniad Arddull Chicago

National Seminar on Petrochemicals Karachi, Pakistan, and Pakistan Institute of Chemical Engineers. National Seminar on Petrochemicals, April 12 & 13, 1981, Karachi. Karachi: The Institute, 1981.

Dyfyniad MLA

National Seminar on Petrochemicals Karachi, Pakistan, and Pakistan Institute of Chemical Engineers. National Seminar on Petrochemicals, April 12 & 13, 1981, Karachi. The Institute, 1981.

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