APA

Laton Anita Duncan, Powers Samuel Ralph, . (1949). New directions in science teaching: A report of a cooperative project in seventeen secondary schools with the Bureau of Educational Research in Science Teachers College, Columbia University. New York, USA: McGraw Hill Book Company Inc.

Chicago

Laton Anita Duncan, Powers Samuel Ralph, . 1949. New directions in science teaching: A report of a cooperative project in seventeen secondary schools with the Bureau of Educational Research in Science Teachers College, Columbia University. New York, USA: McGraw Hill Book Company Inc.

Harvard

Laton Anita Duncan, Powers Samuel Ralph, . (1949). New directions in science teaching: A report of a cooperative project in seventeen secondary schools with the Bureau of Educational Research in Science Teachers College, Columbia University. New York, USA: McGraw Hill Book Company Inc.

MLA

Laton Anita Duncan, Powers Samuel Ralph, . New directions in science teaching: A report of a cooperative project in seventeen secondary schools with the Bureau of Educational Research in Science Teachers College, Columbia University. New York, USA: McGraw Hill Book Company Inc. 1949.