APA引文

Wells, L. (1972). The product life cyle and nternational trade. Havard: President and Fellows of Havard College.

Trích dẫn kiểu Chicago

Wells, Louis. The Product Life Cyle and Nternational Trade. Havard: President and Fellows of Havard College, 1972.

MLA引文

Wells, Louis. The Product Life Cyle and Nternational Trade. Havard: President and Fellows of Havard College, 1972.

警告：這些引文格式不一定是100％准確.