176339 Croom, F. H. (1989). Principles of topology. Philadelphia : Saunders College.
Chicago Style (17th ed.) Citation176339 Croom, Fred H. Principles of Topology. Philadelphia : Saunders College, 1989.
MLA引文176339 Croom, Fred H. Principles of Topology. Philadelphia : Saunders College, 1989.
警告：這些引文格式不一定是100％准確.