Gaya APA
Life world library : Switzerland. (1966).
tempaterbit:
penerbit.
Gaya Chicago
Life world library : Switzerland.
Edisi.
tempaterbit:
penerbit,
1966.
Text.
Gaya MLA
Life world library : Switzerland.
Edisi.
tempaterbit:
penerbit,
1966.
Text.
Gaya Turabian
Life world library : Switzerland.
tempaterbit:
penerbit,
1966.
Print.