TY  - BOOK
AU  - Porter,Patricia A.
AU  - Sharp,Allen W.
TI  - Active English: Understand, practice, communicate 
SN  - 0-13-003400-2(v.1)
PY  - 1977///
CY  - Englewood Cliffs, NJ
PB  - Prentice Hall
KW  - English
N1  - B. 1 (147 p.); B. 2 (150 p.); B. 3 (182 p.)
ER  -