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ทดสอบ
100 Life lessons /
hbr's 10 must reads
Harvard Business ReviewClayton M. ChristensenAdam M. GrantVijay Govindarajan
ทดสอบหนังสือ
Food emulsifiers and their applications
Handbook of cosmetic science and technology
André O. Barel, Marc Paye, Howard I. Maibach