Gaya APA

Elonka, S, M., Kohan, A, L. (1981). Standard boiler operators' questions and answers (5). nEW dELHI: Tata McGraw Hill.

Gaya MLA

Elonka, Stephen, M.., Kohan, Anthony, Lawrence. "Standard boiler operators' questions and answers". 5 nEW dELHI: Tata McGraw Hill, 1981. Text.