Seels, B., & Glasgow, Z. (1990). Exercises in instructional design / Barbara Seels, Zita Glasgow. Merrill.
Cita Chicago (17th ed.)Seels, Barbara, i Zita Glasgow. Exercises in Instructional Design / Barbara Seels, Zita Glasgow. Columbus: Merrill, 1990.
Cita MLA (9th ed.)Seels, Barbara, i Zita Glasgow. Exercises in Instructional Design / Barbara Seels, Zita Glasgow. Merrill, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.