APA Style

KUMAR, D, S., KUMAR, D, V. (2021). ENVIRONMENTAL SCIENCE (1ST). LUCKNOW: THAKUR PVT LUCKNOW.

MLA Style

KUMAR, DR., SURENDRA., KUMAR, DR., VIRENDER. "ENVIRONMENTAL SCIENCE". 1ST LUCKNOW: THAKUR PVT LUCKNOW, 2021. Text.