Fried, Charles
Right and wrong
Harvard University Press, 1978
 Buku Teks SO
Istifatun Zaka
Whats The Matter with Quarter Life Crisis
Buku Bijak, 2022
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Norman, Donald A.
Explorations in cognition
W.H. Freeman, 1975
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Willis, James F.
Explorations in microeconomics
North West Publishing, 2002
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Hollander, Stanley C.
Explorations in retailing
Michigan State University , 1960
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