Ryan, W. T. (1971). Principles of marketing. Richard D. Irwin.
Chicago Style (17th ed.) CitationRyan, William T. Principles of Marketing. Richard D. Irwin, 1971.
MLA (8th ed.) CitationRyan, William T. Principles of Marketing. Richard D. Irwin, 1971.
Warning: These citations may not always be 100% accurate.