Ruffe, R. D`auxion De
La problem Chinois
Paris Stock 1951
 Buku Teks
Farley, Miriam S., author
Aspects of Japan's labor problem
The John Day, 1950
 Buku Teks
Flower, Linda, author
Problem-Solving Strategies for writing
Hancourt Brace Jovanovich, 1981
 Buku Teks
Problem-based learning and creativity
edited by Oon-Seng Tan
Cengage Learning, 2009
 Buku Teks
Maryanov, Gerald S., author
Decentralization in indonesia as a political problem
Equinox Publishing, 2009
 Buku Teks
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