Ikegwuoha, M. C. (1991). Voegelin's philosophical concept of order and history: From a political perspective. Pontificia Universitas Urbaniana.
Chicago Style (17th ed.) CitationIkegwuoha, Michael Chukwunyelunwa. Voegelin's Philosophical Concept of Order and History: From a Political Perspective. Romae: Pontificia Universitas Urbaniana, 1991.
MLA引文Ikegwuoha, Michael Chukwunyelunwa. Voegelin's Philosophical Concept of Order and History: From a Political Perspective. Pontificia Universitas Urbaniana, 1991.
警告:這些引文格式不一定是100%准確.