https://openlibrary.org/books/OL5702003M.opds 2020-10-04T14:06:45Z Stanley P. Wyatt https://openlibrary.org/authors/OL1656661A/Stanley_P._Wyatt Allyn and Bacon Boston 1971 xii, 686 p. 2d ed. Bibliography: p. 663-670. eng https://openlibrary.org/books/OL5702003M https://archive.org/details/principlesofastr02wyat 70131204