Referrence books for B.Com (Mumbai University)

Hey guys..m a lil confused about which books to refer for my T.Y. B.Com for subjects 1.) Export Marketing and 2.)Marketing &  Production Planning? Everyone tells me to refer to Michael Vaz but I feel that if everyone writes from the same book,then everyone will get more or less the same average marks and i want to score better marks. So please suggest some good book which would fetch me more marks in my T.Y. B.Com.