Gaya APA
Principles of teachig. (2006).
New England:
[s.n.].
Gaya Chicago
Principles of teachig.
Ed.9.
New England:
[s.n.],
2006.
Text.
Gaya MLA
Principles of teachig.
Ed.9.
New England:
[s.n.],
2006.
Text.
Gaya Turabian
Principles of teachig.
New England:
[s.n.],
2006.
Print.