Nauheim, F. (1979). Salesman`s complete model letter handbook. Taraporevala.
芝加哥风格引文Nauheim, Ferd. Salesman`s Complete Model Letter Handbook. Bombay: Taraporevala, 1979.
MLA引文Nauheim, Ferd. Salesman`s Complete Model Letter Handbook. Taraporevala, 1979.
警告：这些引文格式不一定是100％准确.