APA

Dubray C. A., . (1912). Introductory philosophy. Longmans, Green, and Co: .

Chicago

Dubray C A, . 1912. Introductory philosophy. Longmans, Green, and Co: .

Harvard

Dubray C. A., . (1912). Introductory philosophy. Longmans, Green, and Co: .

MLA

Dubray C A, . Introductory philosophy. Longmans, Green, and Co: . 1912.