Pregill, P., & Volkman, N. (1993). Landscapes in history: Design and planning in the western tradition. Van Nostrand Reinhold.
Chicago-viite (17. p.)Pregill, Philip, ja Nancy Volkman. Landscapes in History: Design and Planning in the Western Tradition. New York: Van Nostrand Reinhold, 1993.
MLA-viite (9. p.)Pregill, Philip, ja Nancy Volkman. Landscapes in History: Design and Planning in the Western Tradition. Van Nostrand Reinhold, 1993.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.