एपीए उद्धरण

Elonka, S. M. (1973). Standard boiler operators' questions and answers. Tata Mc Graw - Hill.

शिकागो स्टाइल उद्धरण

Elonka, Stephen Michael. Standard Boiler Operators' Questions and Answers. Mumbai: Tata Mc Graw - Hill, 1973.

एमएलए उद्धरण

Elonka, Stephen Michael. Standard Boiler Operators' Questions and Answers. Tata Mc Graw - Hill, 1973.