Powell, L. S. (1964). A guide to the overhead projector. British Association for Commercial and Industrial Education.
Citazione stile Chigago Style (17a edizione)Powell, Leonard Sutherland. A Guide to the Overhead Projector. Lond.: British Association for Commercial and Industrial Education, 1964.
Citatione MLA (8a ed.)Powell, Leonard Sutherland. A Guide to the Overhead Projector. British Association for Commercial and Industrial Education, 1964.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.