LIVINGSTON, G. F. (1960). Learn arithmetic: The easy way. Greystone Press.
芝加哥风格引文LIVINGSTON, Gilbert F. Learn Arithmetic: The Easy Way. Cambridge: Greystone Press, 1960.
MLA引文LIVINGSTON, Gilbert F. Learn Arithmetic: The Easy Way. Greystone Press, 1960.
警告：这些引文格式不一定是100％准确.