TY  - DATA
AU  - Tanton, James
TI  - Trigonometry: a clever study guide 
T2  - Problem Books, 
SN  - 9781614444060 (online)
PY  - 2015///
CY  - [Washington, DC]
PB  - Mathematical Association of America
KW  - Trigonometry
UR  - https://www.ams.org/prb/025
ER  -