The phrase "a great source of both" is correct and usable in written English.
It can be used when referring to something that provides two different benefits or types of information simultaneously.
Example: "The new research paper is a great source of both theoretical insights and practical applications."
Alternatives: "a valuable resource for both" or "an excellent provider of both".
"Hummus is made from chickpeas, which are a great source of both fiber and protein to keep us fuller for longer, while carrots are not only rich in fiber but vitamin A, too, which is essential for healthy vision," Whitehead said.
Anime News Network's (ANN) Melissa Harper praised the differences between Rukia and stereotypical shōnen heroines, asserting that Rukia's loss of her powers and subsequent dependence on Ichigo were "a great source of both drama and comedy in the show".
The herb is a great source of both potassium and iron.
Sunflower seeds are a great source of both vitamin B2 and B6.
Home inspectors would obviously be a great source of information, both academic and practical". "The Mold Survival Guide details mold problems and eradication methods and includes photographs—some in color that show what water damage and mold infestation look like". "Mold.
It's a great source of iodine and antioxidants, both important nutrients for regulating health.
The National War Tax Resistance Coordinating Committee is a great place for individuals who are struggling with issues of war, faith and conscience to turn to, as it has been a great source of support for me, both educationally and inspirationally.
DC Comics have been a great source of material for CW, with both "Arrow" and "The Flash" being breakout hits.
Human B cell-derived antibodies are both a great source of potential antibody therapeutics as well as tools to understand the features that make a good, optimized antibody.
Sports writer Kelly Dwyer has written both an obituary and a great source of quotes and stories about this "NBA saint".
