APA (7th ed.) Citation

(1971). Willems, Piet. . Hartkamp, Siebold. . Jacobs, Antoine. . Baas, Dirk.

Chicago Style (17th ed.) Citation

Willems, Piet. . Hartkamp, Siebold. . Jacobs, Antoine. . Baas, Dirk. 1971.

MLA (8th ed.) Citation

Willems, Piet. . Hartkamp, Siebold. . Jacobs, Antoine. . Baas, Dirk. 1971.

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