Mager, Robert Frank,
Analyzing performance problems, or, You really oughta wanna : how to figure out why people aren’t doing what they should be, and what to do about it / Robert F. Mager, Peter Pipe.
Center for Effective Performance, 1997
 Buku Teks
Cho, Young-Seon, author
Why?: food an nutrition = Why?: Makanan dan gizi
Elex Media Komputindo, 2019
 Buku Teks
Yeongseon, JO, author
Why?: geography and map = Why?: geografi dan peta
Elex Media Komputindo, 2019
 Buku Teks
Youngseon, Jo, author
Why?: numbers and math = Why?: angka dan matematika
Elex Media Komputindo, 2019
 Buku Teks
Juhyeon, KANG, author
why?: Climate change = Why?: Perubahan iklim
Elex Media Komputindo, 2019
 Buku Teks
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