Cita APA (7a ed.)
Singh, Y. K. (2006). Environmental science. New Age International (P) Ltd., Publishers.
Cita Chicago Style (17a ed.)
Singh, Y. K. Environmental Science. New Delhi: New Age International (P) Ltd., Publishers, 2006.
Cita MLA (9a ed.)
Singh, Y. K. Environmental Science. New Age International (P) Ltd., Publishers, 2006.
Precaución: Estas citas no son 100% exactas.