Bleeker, R. J. P. v. G. (1964). Three secrets of development magic. International Labour Organization.
Citazione stile Chigago Style (17a edizione)Bleeker, Rijco Jan Petrus van Glinstra. Three Secrets of Development Magic. International Labour Organization, 1964.
Citatione MLA (9a ed.)Bleeker, Rijco Jan Petrus van Glinstra. Three Secrets of Development Magic. International Labour Organization, 1964.
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