Gaya APA
Applied and Development. (1980).
Jerman:
Laupp Dan Gobel.
Gaya Chicago
Applied and Development.
.
Jerman:
Laupp Dan Gobel,
1980.
.
Gaya MLA
Applied and Development.
.
Jerman:
Laupp Dan Gobel,
1980.
.
Gaya Turabian
Applied and Development.
Jerman:
Laupp Dan Gobel,
1980.
.