Gaya APA

Garrard, C, G., Herman, S, L. (1987). Practical problems in mathematics : for electricians (4th ed). Albany, NY: Delmar.

Gaya MLA

Garrard, Crawford, G.., Herman, Stephen, L.. "Practical problems in mathematics : for electricians". 4th ed Albany, NY: Delmar, 1987. Text.