Engelking, Ryszard (1995). 《Theory of dimensions finite and infinite》. Sigma Series in Pure Mathematics (영어) 10. Heldermann Verlag: Lemgo. ISBN3-88538-010-2. MR1363947. Zbl0872.54002.
Engelking, Ryszard (1989). 《General topology》. Sigma Series in Pure Mathematics (영어) 6 개정 완결판. Berlin: Heldermann Verlag. ISBN3-88538-006-4. MR1039321. Zbl0684.54001.
Hart, Klaas Pieter; Nagata, Jun-iti; Vaughan, Jerry E., 편집. (2004). 《Encyclopedia of general topology》 (영어). Amsterdam: Elsevier. ISBN0-444-50355-2. MR2049453. Zbl1059.54001.
Engelking, Ryszard (1995). 《Theory of dimensions finite and infinite》. Sigma Series in Pure Mathematics (영어) 10. Heldermann Verlag: Lemgo. ISBN3-88538-010-2. MR1363947. Zbl0872.54002.
Engelking, Ryszard (1989). 《General topology》. Sigma Series in Pure Mathematics (영어) 6 개정 완결판. Berlin: Heldermann Verlag. ISBN3-88538-006-4. MR1039321. Zbl0684.54001.
Hart, Klaas Pieter; Nagata, Jun-iti; Vaughan, Jerry E., 편집. (2004). 《Encyclopedia of general topology》 (영어). Amsterdam: Elsevier. ISBN0-444-50355-2. MR2049453. Zbl1059.54001.