TY  - BOOK
AU  -  Marjorie M. Petit; Robert E. Laird; Matthew F. Wyneken; Frances R. Huntoon; Mary D. Abele-Austin; Jean D. Sequeira 
TI  - A Focus on Ratios and Proportions
SN  - 9780429353611
PB  - Taylor and Francis
UR  - http://www.taylorfrancis.com/books/9780429353611
ER  -