My grandfather's favorite quotation is E.E. Cummings's, "The most wasted of all days is one without laughter."

Question

is this right or do I need to make changes

Answer 1

This is how I'd write it:

My grandfather's favorite quotation is from E.E. Cummings: "The most wasted of all days is one without laughter."

Answer 2

My grandfather's favorite quotation is E.E. Cummings's, "The most wasted of all days is one without laughter."