Villaflor, E. T. (1987). The relationships of attitude perceived difficulty and performance of chemistry teachers in Cebu. s.n.
Cita Chicago (17th ed.)Villaflor, Editha T. The Relationships of Attitude Perceived Difficulty and Performance of Chemistry Teachers in Cebu. s.l: s.n, 1987.
Cita MLA (9th ed.)Villaflor, Editha T. The Relationships of Attitude Perceived Difficulty and Performance of Chemistry Teachers in Cebu. s.n, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.