Citação norma APA

Heintel, E. (1986). Was kann ich wissen? Was soll ich tun? Was darf ich hoffen? (1. Aufl.). Wien.

Citação norma Chicago

Heintel, Erich. Was Kann Ich Wissen? Was Soll Ich Tun? Was Darf Ich Hoffen? 1. Aufl. Wien, 1986.

Citação norma MLA

Heintel, Erich. Was Kann Ich Wissen? Was Soll Ich Tun? Was Darf Ich Hoffen? 1. Aufl. Wien, 1986.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.