KELLEY, J. L., & RICHERT, D. (1969). Elementary mathematics for teachers. Holden-Day.
Lua i Stíl Chicago (17ú heag.)KELLEY, John L., agus Donald RICHERT. Elementary Mathematics for Teachers. Berkeley: Holden-Day, 1969.
Lua MLA (9ú heag.)KELLEY, John L., agus Donald RICHERT. Elementary Mathematics for Teachers. Holden-Day, 1969.
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