Association of Geoscientists for International Development & Ricaldi, V. H. (1978). Directory of geoscience departments in universities in developing countries: 1977. Association of Geoscientists for International Development.
Չիկագոյի ոճի (17րդ խմբ.) մեջբերումAssociation of Geoscientists for International Development and Victor Hugo Ricaldi. Directory of Geoscience Departments in Universities in Developing Countries: 1977. St. John's, Newfoundland: Association of Geoscientists for International Development, 1978.
MLA (8րդ խմբ.) ՄեջբերումAssociation of Geoscientists for International Development and Victor Hugo Ricaldi. Directory of Geoscience Departments in Universities in Developing Countries: 1977. Association of Geoscientists for International Development, 1978.
Զգուշացում. այս մեջբերումները միշտ չէ, որ կարող են 100% ճշգրիտ լինել.