Gaya APA

ELONKA, S, M., Robinson, J, F. (1959). STANDARD PLANT OPERATOR`S QUESTIONS AND ANSWER : VOL. I . New York: McGraw-Hill Book Company.

Gaya MLA

ELONKA, Stephen, Michael.., Robinson, Joseph, Frederick.. "STANDARD PLANT OPERATOR`S QUESTIONS AND ANSWER : VOL. I". New York: McGraw-Hill Book Company, 1959. Textbook.