Paunlagui-Gacelo, E. Principles of teaching 1 / Ester P. Gacelo. - Quezon City: C&E Publishing, Inc., c2012. - 126 p.; 22 cm. Includes bibliographical references ISBN: 978-971-9924-82-1 Subjects--Topical Terms: Teaching. Dewey Class. No.: GC 371.102 P333 2012