APA (7th ed.) Citation

Poortinga, Y. (1940). It Fryske folkstoaniel <1860-1930>. van Gorcum.

Chicago Style (17th ed.) Citation

Poortinga, Ype. It Fryske Folkstoaniel <1860-1930>. Assen: van Gorcum, 1940.

MLA (9th ed.) Citation

Poortinga, Ype. It Fryske Folkstoaniel <1860-1930>. van Gorcum, 1940.

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