Pregill, P., & Volkman, N. (1993). Landscapes in history: Design and planning in the western tradition. Van Nostrand Reinhold.
Lua i Stíl Chicago (17ú heag.)Pregill, Philip, agus Nancy Volkman. Landscapes in History: Design and Planning in the Western Tradition. New York: Van Nostrand Reinhold, 1993.
Lua MLA (9ú heag.)Pregill, Philip, agus Nancy Volkman. Landscapes in History: Design and Planning in the Western Tradition. Van Nostrand Reinhold, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.