Gaya APA

Elonka, S, M., Kohan, A, L. (1984). Standard heating and power boiler plant. Questions and answers. A revision of Standard Boiler Operator s. Questions and answers. 1969 (1984). : New York : McGraw-Hill Book Company,.

Gaya MLA

Elonka, Stephen, Michael., Kohan, Anthony, Lawrence. "Standard heating and power boiler plant. Questions and answers. A revision of Standard Boiler Operator s. Questions and answers. 1969". 1984 : New York : McGraw-Hill Book Company,, 1984. Text.