International Federation of Library Associations and Institutions. Working Group on Principles Underlying Subject Heading Languages, International Federation of Library Associations and Institutions. Section on Classification and Indexing. Standing Committee, Lopes, M. I., & Beall, J. (1999). Principles underlying subject heading languages (SHLs). K.G. Saur.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Federation of Library Associations and Institutions. Working Group on Principles Underlying Subject Heading Languages, International Federation of Library Associations and Institutions. Section on Classification and Indexing. Standing Committee, Maria Inês Lopes, και Julianne Beall. Principles Underlying Subject Heading Languages (SHLs). München: K.G. Saur, 1999.
Παραπομπή σε μορφή MLA (8th εκδ.)International Federation of Library Associations and Institutions. Working Group on Principles Underlying Subject Heading Languages, et al. Principles Underlying Subject Heading Languages (SHLs). K.G. Saur, 1999.
