APA (7e ed.) Bronvermelding

Ikegwuoha, M. C. (1991). Voegelin's philosophical concept of order and history: From a political perspective. Pontificia Universitas Urbaniana.

Chicago (17e ed.) Bronvermelding

Ikegwuoha, Michael Chukwunyelunwa. Voegelin's Philosophical Concept of Order and History: From a Political Perspective. Romae: Pontificia Universitas Urbaniana, 1991.

MLA (8e ed.) Bronvermelding

Ikegwuoha, Michael Chukwunyelunwa. Voegelin's Philosophical Concept of Order and History: From a Political Perspective. Pontificia Universitas Urbaniana, 1991.