Defnyddiwr:Trappist the monk/sandbox
Smith, Charles H. "Alfred Russel Wallace: A Capsule Biography". The Alfred Russel Wallace Page hosted by Western Kentucky University. Archifwyd o'r gwreiddiol ar 5 Ebrill 2007. Cyrchwyd 27 Ebrill 2007. Unknown parameter |deadurl= ignored (help); Italic or bold markup not allowed in: |publisher= (help)