Gaya APA

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

Gaya MLA

ELONKA, STEPHEN, MICHAELA., ROBINSON, JOSEPH, FREDERICK. "STANDARD PLANT OPERATOR`S QUESTIONS AND ANSWER : VOL. I". : McGraw-Hill Book Company, 1959. Textbook.