How to cite indirect sources in CSE/CBE (name–year) system?
If you mean by "indirect citation" citing a source cited in another document (which you, most likely, cannot access for some reason) then your citation would be for example:  


  (Rawls 1971, cited in Brown 2008)


See the CSE style guide for more information.
Anyway, I would strongly encourage you to find the original source and to avoid indirect, secondary citations as you do not know whether the citation is correct.