Gaya APA
Singh, Y. K.. (2006).
Environmental science .
New Delhi:
New Age International.
Gaya Chicago
Singh, Y. K..
Environmental science.
New Delhi:
New Age International,
2006.
Buku Non-ketenaganukliran.
Gaya MLA
Singh, Y. K..
Environmental science.
New Delhi:
New Age International,
2006.
Buku Non-ketenaganukliran.
Gaya Turabian
Singh, Y. K..
Environmental science.
New Delhi:
New Age International,
2006.
Buku Non-ketenaganukliran.