Development Academy of the Philippines. (2007). How to develop project feasibility studies (Rev. ed.). Development Academy of the Philippines.
Chicago-referens (17:e uppl.)Development Academy of the Philippines. How to Develop Project Feasibility Studies. Rev. ed. Pasig City: Development Academy of the Philippines, 2007.
MLA-referens (9:e uppl.)Development Academy of the Philippines. How to Develop Project Feasibility Studies. Rev. ed. Development Academy of the Philippines, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.