APA-referens (7:e uppl.)

Hayes, S. P. (1966). Evaluating development projects: A manual for the use of field workers (2nd ed., rev.). Unesco.

Chicago-referens (17:e uppl.)

Hayes, Samuel Perkins. Evaluating Development Projects: A Manual for the Use of Field Workers. 2nd ed., rev. [Paris]: Unesco, 1966.

MLA-referens (9:e uppl.)

Hayes, Samuel Perkins. Evaluating Development Projects: A Manual for the Use of Field Workers. 2nd ed., rev. Unesco, 1966.