Gaya APA
Krashen, Stephen D.. (1987).
Principles and practice in second language acquisition .
New York:
Prentice Hall.
Gaya Chicago
Krashen, Stephen D..
Principles and practice in second language acquisition.
New York:
Prentice Hall,
1987.
Text.
Gaya MLA
Krashen, Stephen D..
Principles and practice in second language acquisition.
New York:
Prentice Hall,
1987.
Text.
Gaya Turabian
Krashen, Stephen D..
Principles and practice in second language acquisition.
New York:
Prentice Hall,
1987.
Print.