Philippines (Republic) Bureau of Public Schools. (1957). Conservation of soil and water for the elementary schools. [s.n.].
Chicago-Zitierstil (17. Ausg.)Philippines (Republic) Bureau of Public Schools. Conservation of Soil and Water for the Elementary Schools. Manila: [s.n.], 1957.
MLA-Zitierstil (9. Ausg.)Philippines (Republic) Bureau of Public Schools. Conservation of Soil and Water for the Elementary Schools. [s.n.], 1957.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.