APA

Committe of the Association of American Geographers on the Status and Trends G in the United States, Committe of the Association of American Geographers on the Status and Trends G in the United States, . (1961). Committe of the Association of American Geographers on the Status and Trends in the United States. : .

Chicago

Committe of the Association of American Geographers on the Status and Trends G in the United States, Committe of the Association of American Geographers on the Status and Trends G in the United States, . 1961. Committe of the Association of American Geographers on the Status and Trends in the United States. : .

Harvard

Committe of the Association of American Geographers on the Status and Trends G in the United States, Committe of the Association of American Geographers on the Status and Trends G in the United States, . (1961). Committe of the Association of American Geographers on the Status and Trends in the United States. : .

MLA

Committe of the Association of American Geographers on the Status and Trends G in the United States, Committe of the Association of American Geographers on the Status and Trends G in the United States, . Committe of the Association of American Geographers on the Status and Trends in the United States. : . 1961.