Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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