APA (7. basım) Alıntı

Hart, R. D. An ecological systems conceptual framework for agricultural research and development.

Chicago Style (17. basım) Atıf

Hart, Robert D. An Ecological Systems Conceptual Framework for Agricultural Research and Development. [Date of publication not identified].

MLA (9th ed.) Atıf

Hart, Robert D. An Ecological Systems Conceptual Framework for Agricultural Research and Development.