National Seminar on Petrochemicals Karachi, Pakistan, & Pakistan Institute of Chemical Engineers. (1981). National Seminar on Petrochemicals, April 12 & 13, 1981, Karachi. The Institute.
Chicago-referens (17:e uppl.)National Seminar on Petrochemicals Karachi, Pakistan, och Pakistan Institute of Chemical Engineers. National Seminar on Petrochemicals, April 12 & 13, 1981, Karachi. Karachi: The Institute, 1981.
MLA-referens (8:e uppl.)National Seminar on Petrochemicals Karachi, Pakistan, och Pakistan Institute of Chemical Engineers. National Seminar on Petrochemicals, April 12 & 13, 1981, Karachi. The Institute, 1981.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.