Παραπομπή APA

Rao, D. P. L. (1990). Energy conservation handbook (Ed.2.). Utility.

Παραπομπή Chicago Style

Rao, Diwakar P L. Energy Conservation Handbook. Ed.2. Seconderabad: Utility, 1990.

Παραπομπή MLA

Rao, Diwakar P L. Energy Conservation Handbook. Ed.2. Utility, 1990.