TY  - BOOK
AU  - Porter,Patricia A.
AU  - Sharp,Allen W.,b.1928
TI  - Active English
SN  - 0130034002
PY  - 1977///
CY  - Englewood Cliffs, N.J.
PB  - Prentice-Hall
KW  - English language
KW  - Textbooks for foreigners
N1  - Book 3, book 1 : understand, practice, communicate
ER  -