KLOPFENSTEIN, K. F. (1991). Exponential and logarithmic functions. Davies and Associates Academic Pub.
Lua i Stíl Chicago (17ú heag.)KLOPFENSTEIN, Kenneth F. Exponential and Logarithmic Functions. Aurora: Davies and Associates Academic Pub, 1991.
Lua MLA (9ú heag.)KLOPFENSTEIN, Kenneth F. Exponential and Logarithmic Functions. Davies and Associates Academic Pub, 1991.
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