16907 F. Bergeron/G. Labelle/P. Leroux: Combinatorial species and tree-like structures. Cambridge UP 1998, 460p. $102. 24031 Francois Bergeron/Gilbert Labelle/Pierre Leroux: Introduction to the theory of species of structures. Univ. Montreal 2008, 137p. 3016 A. Joyal: Une theorie combinatoire des series formelles. Adv. Math. 42 (1981), 1-82. [3570] 2939 M. Mendez/J.S. Yang: Moebius species. Adv. Math. 85 (1991), 83-128. [3570] 25512 Wilhelm Plesken: Algebraische Kombinatorik. Vorl. RWTH Aachen 2014, 170p.