Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (8ú heag.)

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

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