APA

Van Loon H. W., . (1920). Ancient Man, the Beginning of Civilizations. New York - US: Modern Library.

Chicago

Van Loon Hendrik Willem, . 1920. Ancient Man, the Beginning of Civilizations. New York - US: Modern Library.

Harvard

Van Loon H. W., . (1920). Ancient Man, the Beginning of Civilizations. New York - US: Modern Library.

MLA

Van Loon Hendrik Willem, . Ancient Man, the Beginning of Civilizations. New York - US: Modern Library. 1920.