Gaya APA

Elonka, S., F, R, J. (1959). Standard Plant Operator's Questions and Answer vol 1&2 (vol 1 dan 2). new york: McGaw-Hill Book Company.

Gaya MLA

Elonka, Steve., F, Robinson., Joseph. "Standard Plant Operator's Questions and Answer vol 1&2". vol 1 dan 2 new york: McGaw-Hill Book Company, 1959. Teksbook.