Garrido, T. P. (1973). Supplementary teaching materials on pollution for use in high school science classes. s.n.].
Cita Chicago (17th ed.)Garrido, Teresa P. Supplementary Teaching Materials on Pollution for Use in High School Science Classes. [Quezon City: s.n.], 1973.
Cita MLA (9th ed.)Garrido, Teresa P. Supplementary Teaching Materials on Pollution for Use in High School Science Classes. s.n.], 1973.
Atenció: Aquestes cites poden no estar 100% correctes.