APA

National Council for the Social Studies, West E., . (1949). Improving the teaching of world history. Washington: The Council.

Chicago

National Council for the Social Studies, West Edith, . 1949. Improving the teaching of world history. Washington: The Council.

Harvard

National Council for the Social Studies, West E., . (1949). Improving the teaching of world history. Washington: The Council.

MLA

National Council for the Social Studies, West Edith, . Improving the teaching of world history. Washington: The Council. 1949.