APA
Sund R. B., Trowbridge L. W. j. a., . (1974). Student -centered teaching in the secondary school. Columbus, Ohio: Merrill.
Chicago
Sund Robert B, Trowbridge Leslie W jt author, . 1974. Student -centered teaching in the secondary school. Columbus, Ohio: Merrill.
Harvard
Sund R. B., Trowbridge L. W. j. a., . (1974). Student -centered teaching in the secondary school. Columbus, Ohio: Merrill.
MLA
Sund Robert B, Trowbridge Leslie W jt author, . Student -centered teaching in the secondary school. Columbus, Ohio: Merrill. 1974.