Ceaseless explorer : conversation with Joseph Spies / Michelle Rogge ; [ed. Patricia Peterson]. - [Vermillion] : The University of South Dakota Press, 1995. - iii, 175 p. + [39] inset l. ill. ; 23 cm.см.. - Bibliogr.: p. 167-173. - ISBN 0-929925-29-7[MFN: 32363]