Annotated link http://www.diigo.com/bookmark/http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PMARCW000006000001015002000001&idtype=cvips
K. Jöreskog. Structural equation models in the social sciences, volume 1970 of Quantitative studies in social relations, Seminar Press, New York u. a., (1973)