This paper presents a literature review and classification for electronic commerce research. The authors examined 4,948 articles listed in the Science Citation Index Expanded (SCIE) and 2,875 articles in the Social Science Citation Index (SSCI) published from 1999 to 2008. The results revealed that electronic commerce literature can be classified into seven categories: business and management; computer and information science; industrial engineering and operation research; engineering; economics; law; and others. The study also examined the country distribution of authors. This literature review should serve as a supplemental resource for electronic commerce academics to formulate future research.