APA

American textbook publishers institute, . (1949). Textbooks in education: a report from The American textbook publishers institute to its memberships. N.Y: A.T.P.T.

Chicago

American textbook publishers institute, . 1949. Textbooks in education: a report from The American textbook publishers institute to its memberships. N.Y: A.T.P.T.

Harvard

American textbook publishers institute, . (1949). Textbooks in education: a report from The American textbook publishers institute to its memberships. N.Y: A.T.P.T.

MLA

American textbook publishers institute, . Textbooks in education: a report from The American textbook publishers institute to its memberships. N.Y: A.T.P.T. 1949.