APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.