Gaya APA
College Keyboarding Lessons 1-20. ([s.a.]).
New York:
[s.n.].
Gaya Chicago
College Keyboarding Lessons 1-20.
.
New York:
[s.n.],
[s.a.].
Text.
Gaya MLA
College Keyboarding Lessons 1-20.
.
New York:
[s.n.],
[s.a.].
Text.
Gaya Turabian
College Keyboarding Lessons 1-20.
New York:
[s.n.],
[s.a.].
Print.