APA-viite (7. p.)

GUPTA O P. (2019). Elements of Water Pollution Control Engineering (1st.). KHANNA PUBLICATION.

Chicago-viite (17. p.)

GUPTA O P. Elements of Water Pollution Control Engineering. 1st. NEW DELHI: KHANNA PUBLICATION, 2019.

MLA-viite (9. p.)

GUPTA O P. Elements of Water Pollution Control Engineering. 1st. KHANNA PUBLICATION, 2019.