TY  - BOOK
AU  - Deuna,Melecio C.
TI  - Basic trigonometry for secondary Schools
SN  - 9717910391
PY  - 1998///
CY  - Quezon City
PB  - SIBS Pub. House
KW  - Trigonometry
KW  - Study and teaching (Secondary)
N1  - Includes appendices, glossary, bibliography and index
ER  -