(1978). Uitdagende gedachten. [s.n.].
Chicago Style (17th ed.) CitationUitdagende Gedachten. [s.n.], 1978.
MLA (8th ed.) CitationUitdagende Gedachten. [s.n.], 1978.
Warning: These citations may not always be 100% accurate.
APA (7th ed.) Citation