tinbergen, j. (1964). development planning: The sector phase with different gestation periods. the institute of national planning.
Lua i Stíl Chicago (17ú heag.)tinbergen, j. Development Planning: The Sector Phase with Different Gestation Periods. cairo: the institute of national planning, 1964.
Lua MLA (9ú heag.)tinbergen, j. Development Planning: The Sector Phase with Different Gestation Periods. the institute of national planning, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.