Help regarding reference books of cs professional course

Institute Study Materials are more than enough. For practical papers you will require a text book.

Indirect Tax - Bangar

Direct Tax - Vinod Gupta/V.K.Singhania

Apart from these refere guideline answers of the institutes. You can also refere Sangit Kedia sir notes.

Also see below link for some notes for Cs Prof---

Important for CS Professional