KREBS, C. J. (1999). Ecological methodology.-- Ed.2. An Imprint of Addison Wesley Longman.
芝加哥风格引文KREBS, Charles J. Ecological Methodology.-- Ed.2. California: An Imprint of Addison Wesley Longman, 1999.
MLA引文KREBS, Charles J. Ecological Methodology.-- Ed.2. An Imprint of Addison Wesley Longman, 1999.
警告：这些引文格式不一定是100％准确.