Johnston, E. G. (1930). Point systems and awards: The guidance, stimulation and limitation of pupil participation. A.S. Barnes and company, incorporated.
Chicago-referens (17:e uppl.)Johnston, Edgar Grant. Point Systems and Awards: The Guidance, Stimulation and Limitation of Pupil Participation. New York: A.S. Barnes and company, incorporated, 1930.
MLA-referens (9:e uppl.)Johnston, Edgar Grant. Point Systems and Awards: The Guidance, Stimulation and Limitation of Pupil Participation. A.S. Barnes and company, incorporated, 1930.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.