Nelson, Gail K.; Richardson, John V. (1986-01-01). "Adelaide hasse and the early history of the U.S. Superintendent of Documents classification scheme". Government Publications Review. Special Issue Bernard M. Fry Festschrift. 13 (1): 79–96. doi:10.1016/0277-9390(86)90030-0. ISSN0277-9390.
Nelson, Gail K.; Richardson, John V. (1986-01-01). "Adelaide hasse and the early history of the U.S. Superintendent of Documents classification scheme". Government Publications Review. Special Issue Bernard M. Fry Festschrift. 13 (1): 79–96. doi:10.1016/0277-9390(86)90030-0. ISSN0277-9390.