Gaya APA

Laer, P, V. (1953). Philosophico-scientific problems. Transl. by H.J. Koren. . Pittsburgh: Duquesne University Press.

Gaya MLA

Laer, P.H., Van. "Philosophico-scientific problems. Transl. by H.J. Koren. ". Pittsburgh: Duquesne University Press, 1953. Buku.