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