Gaya APA
Touris, O, N, S, D.
(1982).
Steine
(
1st ed)
.
Zurich:
The Swiss National Tourist Office.
Gaya MLA
Touris, OFFICE, National, Suisse, Du.
"Steine".
1st ed
Zurich:
The Swiss National Tourist Office,
1982.
Printed.