Είδος
Electronic books
136
Internet resources
66
Libros electrónicos
46
Electronic journals
15
Periodicals
14
Internet videos
12
Short films
12
Computer network resources
11
Handbooks, manuals, etc
10
Amateurs' manuals
9
Congresses
2
Libros electronicos
2
Tables
2
Case studies
1
Handbooks and manuals
1
Libros de texto
1
Study guides
1
Textbooks
1