.Williams, R. I., & Doris, L. (1956). Encyclopedia of accounting systems. Prentice-Hall.
Chicago (17e ed.) Bronvermelding.Williams, Robert I., en Lillian Doris. Encyclopedia of Accounting Systems. .Englewood Cliffs, N.J: Prentice-Hall, 1956.
MLA (9e ed.) Bronvermelding.Williams, Robert I., en Lillian Doris. Encyclopedia of Accounting Systems. Prentice-Hall, 1956.