Ordoñez, Merlie N. <br/><br/>Development and validation of worktext in applied mathematics  - Morong, Rizal  [publisher not identified]  2011  - 112 leaves ;  28 cm. Thesis (M.A.T.) - University of Rizal System. <br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching -- Aids and devices.<br/>Mathematics -- Study and teaching.<br/><br/><label>Dewey Class. No.: </label>371.33  / Or2d