Li, B., & Zhang, W. (1981). Nong min dui kuo da nong chang gui mo yi yuan yu fang shi zhi fen xi yan jiu (Chu ban.). Cheng wen chu ban she you xian gong si.
Dyfyniad Arddull ChicagoLi, Boxing, and Wenshui Zhang. Nong Min Dui Kuo Da Nong Chang Gui Mo Yi Yuan Yu Fang Shi Zhi Fen Xi Yan Jiu. Chu ban. Taibei Shi: Cheng wen chu ban she you xian gong si, 1981.
Dyfyniad MLALi, Boxing, and Wenshui Zhang. Nong Min Dui Kuo Da Nong Chang Gui Mo Yi Yuan Yu Fang Shi Zhi Fen Xi Yan Jiu. Chu ban. Cheng wen chu ban she you xian gong si, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.