* {{cite book |author-link=Walter Rudin |first=Walter |last=Rudin |title=Principles of Mathematical Analysis |publisher=McGraw-Hill |edition=3rd |year=1976 |isbn=0-07-054235-X }} ''(See chapter 10 for a simple review of topological properties.)'' | * {{cite book |author-link=Walter Rudin |first=Walter |last=Rudin |title=Principles of Mathematical Analysis |publisher=McGraw-Hill |edition=3rd |year=1976 |isbn=0-07-054235-X }} ''(See chapter 10 for a simple review of topological properties.)'' |