Penggayaan APA
GENERAL catalog :. (1990).
Germany:
Leybold Didactic GMBH.
Chicago Style
GENERAL catalog :.
.
Germany:
Leybold Didactic GMBH,
1990.
Buku.
MLA Style
GENERAL catalog :.
.
Germany:
Leybold Didactic GMBH,
1990.
Buku.
Turabian Style
GENERAL catalog :.
Germany:
Leybold Didactic GMBH,
1990.
Buku.