APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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