Hursthouse, Rosalind. Formal logic : a workbook / prepared for the course team by Rosalind Hursthouse, Janet Radcliffe Richards and Tom Sorell. - Milton Keynes : Open University Press, 1980. - 68 p. : Designed to be used with: Logic / Wilfrid Hodges. ISBN: 0335110193 Subjects--Topical Terms: Logic. Dewey Class. No.: 160 / Fo