APA استشهاد

Armstrong ,M.A. (1988). Groups and Symmetry. Springer – Verlag.

استشهاد بنمط شيكاغو

Armstrong ,M.A. Groups and Symmetry. Springer – Verlag, 1988.

MLA استشهاد

Armstrong ,M.A. Groups and Symmetry. Springer – Verlag, 1988.