Hart, R. D. An ecological systems conceptual framework for agricultural research and development.
Cita Chicago (17th ed.)Hart, Robert D. An Ecological Systems Conceptual Framework for Agricultural Research and Development. [Date of publication not identified].
Cita MLA (9th ed.)Hart, Robert D. An Ecological Systems Conceptual Framework for Agricultural Research and Development.
Atenció: Aquestes cites poden no estar 100% correctes.