Maricopa Center for Learning and Instruction. Lesson 12: Address Footers and E-Mail Links. Writing HTML: A Tutorial for Creating Web Pages. Maricopa Community Colleges. 2002 [2007-07-06]. (原始内容存档于2008-05-09) (英语).
Maricopa Center for Learning and Instruction. Lesson 12: Address Footers and E-Mail Links. Writing HTML: A Tutorial for Creating Web Pages. Maricopa Community Colleges. 2002 [2007-07-06]. (原始内容存档于2008-05-09) (英语).