As far as foreign and local writers are concerned then I think some subjects like psychology etc need foreign writers books and some subjects need local books like that of journalism/sociology etc...Just find books which you need..be it foreign book or local book..all are fine.
And as far as your second question is concerned..Well I think two or three books per subject are suitable coz some books are not MADE FOR CSS so you need some more books to get your required topics...
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