Castillo, J. B. (1966). Some factors affecting achievement in elementary science. s.n.].
Citazione stile Chigago Style (17a edizione)Castillo, Jovito B. Some Factors Affecting Achievement in Elementary Science. [Quezon City: s.n.], 1966.
Citatione MLA (9a ed.)Castillo, Jovito B. Some Factors Affecting Achievement in Elementary Science. s.n.], 1966.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.