National Seminar on Petrochemicals Karachi, Pakistan, & Pakistan Institute of Chemical Engineers. (1981). National Seminar on Petrochemicals, April 12 & 13, 1981, Karachi. The Institute.
Lua i Stíl Chicago (17ú heag.)National Seminar on Petrochemicals Karachi, Pakistan, agus Pakistan Institute of Chemical Engineers. National Seminar on Petrochemicals, April 12 & 13, 1981, Karachi. Karachi: The Institute, 1981.
Lua MLA (8ú heag.)National Seminar on Petrochemicals Karachi, Pakistan, agus Pakistan Institute of Chemical Engineers. National Seminar on Petrochemicals, April 12 & 13, 1981, Karachi. The Institute, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.