एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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