Pollock, J. E., & Ford, S. M. (2009). Improving student learning one principal at a time. Association for Supervision and Curriculum Development.
Lua i Stíl Chicago (17ú heag.)Pollock, Jane E., agus Sharon M. Ford. Improving Student Learning One Principal at a Time. Alexandria, VA: Association for Supervision and Curriculum Development, 2009.
Lua MLA (9ú heag.)Pollock, Jane E., agus Sharon M. Ford. Improving Student Learning One Principal at a Time. Association for Supervision and Curriculum Development, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.