Mahar, Paul
Teach yourself IntraBuilder in 21 days
Sams.net, 1997
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Cassel, Paul
Teach yourself Windows 98 in 21 days
SAMS Pub., 1998
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Mahar, Paul
Teach yourself IntraBuilder in 21 days / Paul Mahar, Ken Henderson
Sam.net Publishing, 1997
Buku Referensi
Arnush, Craig
Teach yourself Turbo C++ 4.5 for Windows in 21 days
Sams Pub., 1995
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Nanang Qosim Yusuf
21 Days to be trans human: panduan menjadi manusia di atas rata-rata
Zaman, 2011
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