Unknown creator; St. Louis University; Parks College of Saint Louis University. (1941). Parks College industrial machine shop.
Chicago-viite (17. p.)Unknown creator; St. Louis University; Parks College of Saint Louis University. Parks College Industrial Machine Shop. 1941.
MLA-viite (8. p.)Unknown creator; St. Louis University; Parks College of Saint Louis University. Parks College Industrial Machine Shop. 1941.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.