HARKNESS, S. P. (1976). Building Without Barries For The Disable Sarah P. Harkness And Jmaes N. Groom. Watson-Guptill.
Chicago-viite (17. p.)HARKNESS, Sarah P. Building Without Barries For The Disable Sarah P. Harkness And Jmaes N. Groom. Watson-Guptill, 1976.
MLA-viite (8. p.)HARKNESS, Sarah P. Building Without Barries For The Disable Sarah P. Harkness And Jmaes N. Groom. Watson-Guptill, 1976.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.