TY  - BOOK
AU  - Bartle, Richard A
TI  - Beyond game design : nine steps towards creating better videogames
SN  - 9781584506713
U1  - 79815711 BAT 
PY  - 2009///
CY  - Boston, MA
PB  - Charles River Media/Cengage Technology
KW  - Video games - Design
ER  -