APA-viite

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

Chicago-tyylinen lähdeviittaus

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

MLA-viite

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

Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.