Gaya APA
HARMON, F, L., DUPREE, D, E. (1966).
MODERN COLLEGE TRIGONOMETRY .
Belmont, California:
Dickenson Publishing Company.
Gaya MLA
HARMON, Frank, L.., DUPREE, DANIEL, E..
"MODERN COLLEGE TRIGONOMETRY".
Belmont, California:
Dickenson Publishing Company,
1966.
Textbook.