1. Aguiar, M., Mahajan, S.: Monoidal Functors, Species and Hopf Algebras. CRM Monograph Series, vol. 29. American Mathematical Society, Providence (2010)
2. Eckmann, B., Hilton, P.J.: Group-like structures in general categories. I. Multiplications and comultiplications. Math. Ann. 145(3), 227–255 (1962)
3. Kelly, G.M.: On MacLane’s conditions for coherence of natural associativities, commutativities, etc. J. Algebra 1(4), 397–402 (1964)
4. Kelly, G.M.: Doctrinal adjunction. In: Kelly, G.M. (ed.) Category Seminar Sydney 1972/1973. Lecture Notes in Mathematics, vol. 420, pp. 257–280. Springer, Berlin (1974)
5. Mac Lane, S.: Categories for the Working Mathematician. Springer, Berlin (1978)