You could take help from Igneous and metamorphic Peterology book by Philpotts. Winter's book doesn't have this diagram and it's descriptions are not upto the mark...
This question is from JAM 2019(MSQ) to get idea about these plots, refer JD winter, that's where you will get to know more about various binary and ternary phase diagrams.. But if ...
This phase diagram is associated with basalt tetrahedron. You can read in detail about this topic in chapter 8 or 9 (if I am correct) of J D WINTER'S book.
Answer: You can read more about this Diagram in J D Winter's igneous petrology book.
These ternary diagrams are not much important for JAM exam. Two components system and basics ...