LIVINGSTON, G. F. (1960). Learn arithmetic: The easy way. Greystone Press.
Lua i Stíl Chicago (17ú heag.)LIVINGSTON, Gilbert F. Learn Arithmetic: The Easy Way. Cambridge: Greystone Press, 1960.
Lua MLA (9ú heag.)LIVINGSTON, Gilbert F. Learn Arithmetic: The Easy Way. Greystone Press, 1960.
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