Makarenko, A.S.
Foreign Languages Publishing House, 1920
Buku Teks
Ackerman, Robert
Cambridge University Press , 1990
Buku Teks
Posener, Julius
MIT Pres, 1992
Buku Teks
Enan, M.A.
Ashraf, 1946
Buku Teks
Cannell, D.M.
Society for Industrial and Applied Mathematics, 2001
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