Παραπομπή APA

Williams, D. T. (1967). Commerce (3rd ed.). Longmans.

Παραπομπή Chicago Style

Williams, D. Treharne. Commerce. 3rd ed. London: Longmans, 1967.

Παραπομπή MLA

Williams, D. Treharne. Commerce. 3rd ed. Longmans, 1967.