Gaya APA

Swanson, C, P., Mullin, R, C. (1987). Electrical wiring residential based on the 1987 National Electrical ì Code . New York: New York: Delmar; 1987.

Gaya MLA

Swanson, Carl, P.., Mullin, Ray, C.. "Electrical wiring residential based on the 1987 National Electrical ì Code". New York: New York: Delmar; 1987, 1987. Text.