APA استشهاد

Barbu, Z. (1960). Problems of historical psychology. RKP.

استشهاد بنمط شيكاغو

Barbu, Zevedei. Problems of Historical Psychology. London: RKP, 1960.

MLA استشهاد

Barbu, Zevedei. Problems of Historical Psychology. RKP, 1960.