Graaf, I. R. d. (1983). Appendix II. Cantho: The Cantho University.
Trích dẫn kiểu ChicagoGraaf, I. R. de. Appendix II. Cantho: The Cantho University, 1983.
MLA引文Graaf, I. R. de. Appendix II. Cantho: The Cantho University, 1983.
警告：這些引文格式不一定是100％准確.