Hayes, S. P. (1966). Evaluating development projects: A manual for the use of field workers (2nd ed., rev.). Unesco.
Lua i Stíl Chicago (17ú heag.)Hayes, Samuel Perkins. Evaluating Development Projects: A Manual for the Use of Field Workers. 2nd ed., rev. [Paris]: Unesco, 1966.
Lua MLA (9ú heag.)Hayes, Samuel Perkins. Evaluating Development Projects: A Manual for the Use of Field Workers. 2nd ed., rev. Unesco, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.