APA-ийн эшлэл(7 дахь хэвлэлт)

ebrary, Inc, & Melark, P. G. (2012). Comets: Characteristics, composition and orbits. Nova Science Publishers.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

ebrary, Inc, ба Peter G. Melark. Comets: Characteristics, Composition and Orbits. Hauppauge, N.Y.: Nova Science Publishers, 2012.

MLA -ийн эшлэл (9 дэх хэвлэлт)

ebrary, Inc, ба Peter G. Melark. Comets: Characteristics, Composition and Orbits. Nova Science Publishers, 2012.