TY  - BOOK
AU  - Banagua,Emelyn C.
AU  - Bantug,Jenette S.
AU  - Endam,Joemar C.
AU  - Mamhot,Alice A.
TI  - Plane and spherical trigonometry: a tetrahedron approach 
SN  - 9789719654056
PY  - 2015///
CY  - Manila
PB  - Unlimited Books Library Services & Publishing Inc
KW  - Trigonometry
KW  - sears
N1  - References: p.213
ER  -