TY  - BOOK
AU  - 3G E-Learning 
TI  - Core concepts in computer science: Operating system 
SN  - 987-1-98462-063-7
U1  - Cir. 005.43 477 C2019 
PY  - 2019///
CY  - New York 
PB  - 3G E-Learning LLC 
ER  -