APA

Bruce H., Hampfler G. & Henry Francis du Pont Winterthur Museum. (19691968). The gardens of Winterthur in all seasons. New York: Viking Press.

Chicago

Bruce Hal, Hampfler Gottlieb and Henry Francis du Pont Winterthur Museum. 19691968. The gardens of Winterthur in all seasons. New York: Viking Press.

Harvard

Bruce H., Hampfler G. and Henry Francis du Pont Winterthur Museum. (19691968). The gardens of Winterthur in all seasons. New York: Viking Press.

MLA

Bruce Hal, Hampfler Gottlieb and Henry Francis du Pont Winterthur Museum. The gardens of Winterthur in all seasons. New York: Viking Press. 19691968.