APA (7th ed.) Citation

(1955). V.l.n.r: Van der Waerden, Troelstra, Broeksz, van Zutphen, Drees.

Chicago Style (17th ed.) Citation

V.l.n.r: Van Der Waerden, Troelstra, Broeksz, Van Zutphen, Drees. 1955.

MLA (8th ed.) Citation

V.l.n.r: Van Der Waerden, Troelstra, Broeksz, Van Zutphen, Drees. 1955.

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