APA (7th ed.) Citation

(1903). Troelstra, Pieter Jelles. . Troelstra, Jelle.

Chicago Style (17th ed.) Citation

Troelstra, Pieter Jelles. . Troelstra, Jelle. 1903.

MLA (8th ed.) Citation

Troelstra, Pieter Jelles. . Troelstra, Jelle. 1903.

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