Preston, G. H. (1959). Preston/Su niño y la salud mental (1a. ed.). Hvmanitas.
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Dyfyniad Arddull Chicago
Preston, George H. Preston/Su Niño Y La Salud Mental. 1a. ed. Buenos Aires: Hvmanitas, 1959.
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Dyfyniad MLA
Preston, George H. Preston/Su Niño Y La Salud Mental. 1a. ed. Hvmanitas, 1959.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.