Formacion, P. S. Inquiry slides for teaching ecology in the elementary grades.
Cita Chicago (17th ed.)Formacion, Placida S. Inquiry Slides for Teaching Ecology in the Elementary Grades. Quezon City, 1973.
Cita MLA (9th ed.)Formacion, Placida S. Inquiry Slides for Teaching Ecology in the Elementary Grades.
Atenció: Aquestes cites poden no estar 100% correctes.