APA (7th ed.) Citation

Paërl, H. (1969). De helpers helpen zichzelf.

Chicago Style (17th ed.) Citation

Paërl, Hetty. De Helpers Helpen Zichzelf. 1969.

MLA (8th ed.) Citation

Paërl, Hetty. De Helpers Helpen Zichzelf. 1969.

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