Vierwaldstättersee.
MLA
Vierwaldstättersee. Schweizerische Landestopographie, 1907. https://collections.library.yale.edu/catalog/15826877.
APA, 6th edition
Vierwaldstättersee. (1907). [Relief maps]. Schweizerische Landestopographie, https://collections.library.yale.edu/catalog/15826877.