APA-ийн эшлэл(7 дахь хэвлэлт)

Purcell, E. A. (1973). The crisis of democratic theory: Scientific naturalism & the problem of value. University Press of Kentucky.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Purcell, Edward A. The Crisis of Democratic Theory: Scientific Naturalism & the Problem of Value. [Lexington]: University Press of Kentucky, 1973.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Purcell, Edward A. The Crisis of Democratic Theory: Scientific Naturalism & the Problem of Value. University Press of Kentucky, 1973.