Welchons, A. (1962). Modern trigonometry. Ginn.
Tohutoru Kātū Chicago (17th ed.)Welchons, A.M. Modern Trigonometry. Boston: Ginn, 1962.
Tohutoro MLA (9th ed.)Welchons, A.M. Modern Trigonometry. Ginn, 1962.
Kia tūpato: Kāore pea ēnei kupu hautoa i te ōrite pū 100%.