Gaya APA

Campbell, R, N., Linfors, J, W. (1969). Insights into english structure : A programmed course . New Jersey: Prentice-Hall, Inc.

Gaya MLA

Campbell, Russel, N.., Linfors, Judith, W.. "Insights into english structure : A programmed course". New Jersey: Prentice-Hall, Inc, 1969. Text.