APA

Kirn E., Hartmann P., . (1990). Interactions I. New York: McGraw-Hill.

Chicago

Kirn Elaine, Hartmann Pamela, . 1990. Interactions I. New York: McGraw-Hill.

Harvard

Kirn E., Hartmann P., . (1990). Interactions I. New York: McGraw-Hill.

MLA

Kirn Elaine, Hartmann Pamela, . Interactions I. New York: McGraw-Hill. 1990.