Não informado. (1971). NLL Announcement Bulletin. National Lending Library for Science and Technology.
Style de citation Chicago (17e éd.)Não informado. NLL Announcement Bulletin. Boston, Inglaterra: National Lending Library for Science and Technology, 1971.
Style de citation MLA (8e éd.)Não informado. NLL Announcement Bulletin. National Lending Library for Science and Technology, 1971.
Attention : ces citations peuvent ne pas être correctes à 100%.