De La Pena, C. R. (1972). A study of difficulties in teaching elementary mathematics encountered by student teachers and interns of the Philippine Normal College.
Citazione stile Chigago Style (17a edizione)De La Pena, Carmen Relunia. A Study of Difficulties in Teaching Elementary Mathematics Encountered by Student Teachers and Interns of the Philippine Normal College. 1972.
Citatione MLA (9a ed.)De La Pena, Carmen Relunia. A Study of Difficulties in Teaching Elementary Mathematics Encountered by Student Teachers and Interns of the Philippine Normal College. 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.