Kilpatrick, W. H. (1926). The project method: The use of the purposeful act in the educative process. Teachers college, Columbia university.
Lua i Stíl Chicago (17ú heag.)Kilpatrick, William Heard. The Project Method: The Use of the Purposeful Act in the Educative Process. New York city: Teachers college, Columbia university, 1926.
Lua MLA (8ú heag.)Kilpatrick, William Heard. The Project Method: The Use of the Purposeful Act in the Educative Process. Teachers college, Columbia university, 1926.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.