APA引文

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引文

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

警告：這些引文格式不一定是100％准確.