Turok, Kipi
Mexico
Ammex Asociados
[198-]
Wright, Rosalind
New York
McGraw-Hill Book Company
1987
Larsen-Freeman, Diane
Australia
Heinle
2003
838466753
Peterson 's
1999
768904501
Thomson Learning
2004
768913985
768912687
Stelzer, Richard J.
2002
1560798556
076891177X
Barcsay Jenő
Madrid
Ediciones Daimon
1973
8423106853