This is a book reference [Okuda1993]. Okuda and Okuda remarked this previously [1993].

This is a journal article reference [Wilcox1991]. Wilcox remarked this previously [1991].

This is a newspaper article reference [DiRado1995]. Di Rado remarked this previously [1995].

This is a newspaper article reference without an author [Anonymous2003]. remarked this previously [2003].

This is a magazine article reference [DiRado1995a]. Di Rado remarked this previously [1995].

This is a book chapter reference [James1988]. James remarked this previously [1988].

This is a web page reference [Lynch1996]. Lynch remarked this previously [1996].