APA-ийн эшлэл(7 дахь хэвлэлт)

Perl, E. D. (2014). Thinking being: Introduction to metaphysics in the classical tradition. Brill.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Perl, Eric David. Thinking Being: Introduction to Metaphysics in the Classical Tradition. Leiden, [The Netherlands]: Brill, 2014.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Perl, Eric David. Thinking Being: Introduction to Metaphysics in the Classical Tradition. Brill, 2014.