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