Ferre, L. (1972). Proprietary fund for the progress of Puerto Rico: An application of the Kelsonian theory, officially recommended by the Governor of Puerto Rico, and other studies on the subject. Araneta University Research Foundation.
Cytowanie według stylu Chicago (wyd. 17)Ferre, Luis. Proprietary Fund for the Progress of Puerto Rico: An Application of the Kelsonian Theory, Officially Recommended by the Governor of Puerto Rico, and Other Studies on the Subject. Malabon, Rizal: Araneta University Research Foundation, 1972.
Cytowanie według stylu MLA (wyd. 9)Ferre, Luis. Proprietary Fund for the Progress of Puerto Rico: An Application of the Kelsonian Theory, Officially Recommended by the Governor of Puerto Rico, and Other Studies on the Subject. Araneta University Research Foundation, 1972.