Não informado. (1971). NLL Announcement Bulletin. National Lending Library for Science and Technology.
Chicagoスタイル(17版)引用形式Não informado. NLL Announcement Bulletin. Boston, Inglaterra: National Lending Library for Science and Technology, 1971.
MLA(8版)引用形式Não informado. NLL Announcement Bulletin. National Lending Library for Science and Technology, 1971.
警告: この引用は必ずしも正確ではありません.