APA

Gabrielsen M. A., Holtzer C., . (1965). The role of outdoor education. New York: Center for Applied Research in Education.

Chicago

Gabrielsen M Alexander, Holtzer Charles, . 1965. The role of outdoor education. New York: Center for Applied Research in Education.

Harvard

Gabrielsen M. A., Holtzer C., . (1965). The role of outdoor education. New York: Center for Applied Research in Education.

MLA

Gabrielsen M Alexander, Holtzer Charles, . The role of outdoor education. New York: Center for Applied Research in Education. 1965.