APA Style
Royen, P, V. (1932).
The Alpine Flora of New Guinea vol 4: Taxonomic part casuarinaceae to asteraceae (4).
Liechtenstein:
J. Cramer.
MLA Style
Royen, Pieter, Van.
"The Alpine Flora of New Guinea vol 4: Taxonomic part casuarinaceae to asteraceae".
4
Liechtenstein:
J. Cramer,
1932.
Digital.