APA (7th ed.) Citation

Niggli, P. (1940). Der Kristall. Orell Füssli.

Chicago Style (17th ed.) Citation

Niggli, Paul. Der Kristall. Zürich: Orell Füssli, 1940.

MLA (9th ed.) Citation

Niggli, Paul. Der Kristall. Orell Füssli, 1940.

Warning: These citations may not always be 100% accurate.