Nagel, T. S., & Richman, P. T. (1972). Competency-based instruction: A strategy to eliminate failure; a branching programmed text. C.E. Merrill Pub.
Цитирование в стиле Чикаго (17-е изд.)Nagel, Thomas S., и Paul T. Richman. Competency-based Instruction: A Strategy to Eliminate Failure; a Branching Programmed Text. Columbus, Ohio: C.E. Merrill Pub, 1972.
Цитирование MLA (9-е изд.)Nagel, Thomas S., и Paul T. Richman. Competency-based Instruction: A Strategy to Eliminate Failure; a Branching Programmed Text. C.E. Merrill Pub, 1972.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.