Ball, D. (2017). Backwards and forwards: A technical manual for reading plays. Southern Illinois University Press.
Chicago-referens (17:e uppl.)Ball, David. Backwards and Forwards: A Technical Manual for Reading Plays. Carbondale: Southern Illinois University Press, 2017.
MLA-referens (9:e uppl.)Ball, David. Backwards and Forwards: A Technical Manual for Reading Plays. Southern Illinois University Press, 2017.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.