Gaya APA
Trigonometry : A skills approach lecture version. (1980).
Boston:
[s.n.].
Gaya Chicago
Trigonometry : A skills approach lecture version.
.
Boston:
[s.n.],
1980.
Text.
Gaya MLA
Trigonometry : A skills approach lecture version.
.
Boston:
[s.n.],
1980.
Text.
Gaya Turabian
Trigonometry : A skills approach lecture version.
Boston:
[s.n.],
1980.
Print.