APA-ийн эшлэл(7 дахь хэвлэлт)

Ramm, B. (1953). Types of apologetic systems: An introductory study to the Christian philosophy of religion. Van Kampen.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Ramm, Bernard. Types of Apologetic Systems: An Introductory Study to the Christian Philosophy of Religion. Wheaton: Van Kampen, 1953.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Ramm, Bernard. Types of Apologetic Systems: An Introductory Study to the Christian Philosophy of Religion. Van Kampen, 1953.