ebrary, Inc, Hofmann, K. H., Lawson, J. D., & Pym, J. S. (1990). The analytical and topological theory of semigroups: Trend and developments. W. de Gruyter.
Chicago-viite (17. p.)ebrary, Inc, Karl Heinrich Hofmann, Jimmie D. Lawson, ja J. S. Pym. The Analytical and Topological Theory of Semigroups: Trend and Developments. Berlin ; New York: W. de Gruyter, 1990.
MLA-viite (9. p.)ebrary, Inc, et al. The Analytical and Topological Theory of Semigroups: Trend and Developments. W. de Gruyter, 1990.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.