Campbell, R. N. (1969). Insights into english structure: A programmed course. Englewood Cliffs, N.J: Prentice-Hall.
शिकागो स्टाइल उद्धरणCampbell, Russell N. Insights Into English Structure: A Programmed Course. Englewood Cliffs, N.J: Prentice-Hall, 1969.
एमएलए उद्धरणCampbell, Russell N. Insights Into English Structure: A Programmed Course. Englewood Cliffs, N.J: Prentice-Hall, 1969.
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