Tuckman, H. P., Coyle, S., & Bae, Y. (1990). On time to the doctorate: A study of the increased time to complete doctorates in science and engineering. National Academy Press.
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Dyfyniad Arddull Chicago
Tuckman, Howard P., Susan Coyle, and Yupin Bae. On Time to the Doctorate: A Study of the Increased Time to Complete Doctorates in Science and Engineering. Washington, D.C.: National Academy Press, 1990.
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Dyfyniad MLA
Tuckman, Howard P., et al. On Time to the Doctorate: A Study of the Increased Time to Complete Doctorates in Science and Engineering. National Academy Press, 1990.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.