Ingels, J. E. (1997). Landscaping principles and practices (5th ed.). Delmar Pubs.
Cita Chicago (17th ed.)Ingels, Jack E. Landscaping Principles and Practices. 5th ed. Albany, New York: Delmar Pubs, 1997.
Cita MLA (9th ed.)Ingels, Jack E. Landscaping Principles and Practices. 5th ed. Delmar Pubs, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.