Umali, C. B., Jr. Rural-rural interaction model: A model for regional planning in dualistic economies in crisis. Philippine planning journal.
Cita Chicago (17th ed.)Umali, Cesar B., Jr. "Rural-rural Interaction Model: A Model for Regional Planning in Dualistic Economies in Crisis." Philippine Planning Journal .
Cita MLA (9th ed.)Umali, Cesar B., Jr. "Rural-rural Interaction Model: A Model for Regional Planning in Dualistic Economies in Crisis." Philippine Planning Journal, .
Atenció: Aquestes cites poden no estar 100% correctes.