Gaya APA
Heumann, G, W. (1961).
Magnetic control of industrial motors, part 1: alternating control of industrial motors .
New York:
John Wiley & Sons.
Gaya MLA
Heumann, Gerhart, W.
"Magnetic control of industrial motors, part 1: alternating control of industrial motors".
New York:
John Wiley & Sons,
1961.
Text.