Gaya APA
Geoffry, Dudley A. (1986).
Double Your Learning power .
California:
Thorson.
Gaya Chicago
Geoffry, Dudley A.
Double Your Learning power.
California:
Thorson,
1986.
Text.
Gaya MLA
Geoffry, Dudley A.
Double Your Learning power.
California:
Thorson,
1986.
Text.
Gaya Turabian
Geoffry, Dudley A.
Double Your Learning power.
California:
Thorson,
1986.
Print.