Sta. Maria, C. B. (1979). Difficulties of teachers teaching elementary mathematics in the public elementary schools in the Division of Dagupan City for the school year 1961-1972: A critical analysis. University of the Philippines Library.
Cita Chicago (17th ed.)Sta. Maria, Celerina B. Difficulties of Teachers Teaching Elementary Mathematics in the Public Elementary Schools in the Division of Dagupan City for the School Year 1961-1972: A Critical Analysis. Quezon City: University of the Philippines Library, 1979.
Cita MLA (9th ed.)Sta. Maria, Celerina B. Difficulties of Teachers Teaching Elementary Mathematics in the Public Elementary Schools in the Division of Dagupan City for the School Year 1961-1972: A Critical Analysis. University of the Philippines Library, 1979.