Dyfyniad APA

(1989). National Electrical Code Blueprint Reading. American Technical Publishers.

Dyfyniad Arddull Chicago

National Electrical Code Blueprint Reading. American Technical Publishers, 1989.

Dyfyniad MLA

National Electrical Code Blueprint Reading. American Technical Publishers, 1989.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.