Gaya APA
Research in education. (1977).
New Jersey:
Prentice Hall Inc..
Gaya Chicago
Research in education.
.
New Jersey:
Prentice Hall Inc.,
1977.
Buku.
Gaya MLA
Research in education.
.
New Jersey:
Prentice Hall Inc.,
1977.
Buku.
Gaya Turabian
Research in education.
New Jersey:
Prentice Hall Inc.,
1977.
Buku.