APA (7e ed.) Bronvermelding

LEFFINGWELL, W. H. (1975). Textbook Of Office Management William H. Leffingwell Dan Edwin M. Robinson. McGraw-Hill.

Chicago (17e ed.) Bronvermelding

LEFFINGWELL, William H. Textbook Of Office Management William H. Leffingwell Dan Edwin M. Robinson. McGraw-Hill, 1975.

MLA (8e ed.) Bronvermelding

LEFFINGWELL, William H. Textbook Of Office Management William H. Leffingwell Dan Edwin M. Robinson. McGraw-Hill, 1975.