There is no universal standard. It all depends what scientific journal you are aiming for. Nevertheless, here are some examples. I hope it will help.
Papers: (authors, year, name of article, name of journal italics, volume in bold, pages)
Schuster, P., and Sigmund, K. 1983. Replicator dynamics, J. Theor. BioL , 100, 535-538.
Peck, J.R. and Feldman, M.W. 1988. Kin selection and the evolution of
monogamy, Science, 240, 1672-1674.
Books: (authors, year, name of book in quotation, name of publisher)
Hofbauer, J., and Sigmund, K. 1988. “The Theory of Evolution and Dynamical Systems,” Cambridge Univ. Press.
Freidlin, M. I., and Wentzell, A.D. 1994. “Random Perturbations of Dynamical
Systems,” Springer-Verlag. Berlin/New York.