Harper, J. R. (1915). A survey of opportunities for vocational education in and near Philadelphia. Public Education Association.
Lua i Stíl Chicago (17ú heag.)Harper, Jane Roberts. A Survey of Opportunities for Vocational Education in and Near Philadelphia. Philadelphia: Public Education Association, 1915.
Lua MLA (8ú heag.)Harper, Jane Roberts. A Survey of Opportunities for Vocational Education in and Near Philadelphia. Public Education Association, 1915.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.