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Buku Teks
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MacMillan, 1987
Buku Teks
the American Society of Mechanical Engineers, 2018
Majalah, Jurnal, Buletin
Mulder, D. C.
Badan Penerbit Kristen, 1961
Buku Teks
Sumner, William Graham
New Haven Yale University Press, 1950
Buku Teks