Karl, K. F. (1968). Industrial parks and districts: An annotated bibliography. Council of Planning Librarians.
Chicago-viite (17. p.)Karl, Kenyon F. Industrial Parks and Districts: An Annotated Bibliography. Monticello, Ill: Council of Planning Librarians, 1968.
MLA-viite (9. p.)Karl, Kenyon F. Industrial Parks and Districts: An Annotated Bibliography. Council of Planning Librarians, 1968.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.