Gershwin, Eric, author
Asthma stop suffering, star living
Addison-Wesley, 1992
 Buku Referensi
Owen, Andrea, author
How to stop feeling like sh*t
Solusi Mitra Media, 2017
 Buku Teks
Chant, Bent, author
How to start a service business : the 21st century entrepreneur
Avon Books, 1994
 Buku Teks
Hendro, author
How to become a smart entrepreneur and to start a new business
Andi, 2005
 Buku Teks
Greene, Gardiner G., author
How to start and manage your own business
McGraw-Hill, 1975
 Buku Teks
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