Rudolph, N. (1974). Workyards: Playgrounds planned for adventure. Teachers College Press.
Chicago-viite (17. p.)Rudolph, Nancy. Workyards: Playgrounds Planned for Adventure. New York: Teachers College Press, 1974.
MLA-viite (8. p.)Rudolph, Nancy. Workyards: Playgrounds Planned for Adventure. Teachers College Press, 1974.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.