APA استشهاد

Heaton , C. .. A.. (1984). An introduction to industrial chemistry. Leonard hill.

استشهاد بنمط شيكاغو

Heaton , C . A. An Introduction to Industrial Chemistry. New Delhi: Leonard hill, 1984.

MLA استشهاد

Heaton , C . A. An Introduction to Industrial Chemistry. Leonard hill, 1984.