1
著者: Gutiérrez Tobar, Edimer,
出版事項 2010
...Electronic books....
Digitalia Hispánica
eBook
2
著者: Armstrong, Michael, 1928-
出版事項 2008
...Electronic books....
Full text available from Career & Technical Education Database
電子媒体 eBook
3
著者: Gámez Gutiérrez, Jorge Alberto,
出版事項 2013
...Electronic books....
Digitalia Hispánica
eBook