ebrary, Inc, & Melark, P. G. (2012). Comets: Characteristics, composition and orbits. Nova Science Publishers.
芝加哥风格引文ebrary, Inc, 与 Peter G. Melark. Comets: Characteristics, Composition and Orbits. Hauppauge, N.Y.: Nova Science Publishers, 2012.
MLA引文ebrary, Inc, 与 Peter G. Melark. Comets: Characteristics, Composition and Orbits. Nova Science Publishers, 2012.
警告：这些引文格式不一定是100％准确.