TY  - BOOK
AU  - Johnson,W.
TI  - Fifty subroutines for the sinclair spectrum
SN  - 0905104978
U1  - QA/76.8 
PY  - 1983///
CY  - Wilmslow, Chesdire
PB  - Sigma Technical Press.
KW  - Sinclair ZX spectrum (Computer) -- Programming.
ER  -