Gress, J. R., & Purpel, D. E. (1978). Curriculum: An introduction to the field. McCutchan.
Lua i Stíl Chicago (17ú heag.)Gress, James R., agus David E. Purpel. Curriculum: An Introduction to the Field. California: McCutchan, 1978.
Lua MLA (9ú heag.)Gress, James R., agus David E. Purpel. Curriculum: An Introduction to the Field. McCutchan, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.