Gaya APA
Beakley, G, C., Chilton, E, G. (1973).
Introduction to engineering design and graphics .
United States of America:
The Macmillan.
Gaya MLA
Beakley, George, C., Chilton, Ernest, G..
"Introduction to engineering design and graphics".
United States of America:
The Macmillan,
1973.
Text.