Wainwright, G. (1999). Tricky business letters. Universities Press.
芝加哥风格引文Wainwright, Gordon. Tricky Business Letters. Hyderabad: Universities Press, 1999.
MLA引文Wainwright, Gordon. Tricky Business Letters. Universities Press, 1999.
警告：这些引文格式不一定是100％准确.