Porpoise,
You can find some of this by looking up various saint-philosophers.
As Lokavidu explains, there are acharyas who debated this..
Ramanuja was one of the big ones for Dvaita, he is mostly admired by Vaisnava (and was one.) Especially in Gaudiya Vaisnavism.
You should be able to find some things he's written.
Ramanuja.
Then, for Advaita you also have Sankaracarya, but he is a bit ancient.
At the end, he wrote for Bhakti (worship and devotion of God in a a personal sense, i.e., Dvaita), in his work "Bhaja Govindam."
You can find this and commentaries of it.
http://www.dattavani.org/pravachana-...haja-govindam/
Sort of an intro, the rest is good.
Besides this, Swami Vivekananda comes to mind as well. Swami Vivekananda is one of the greatest thought by many. He wrote and explained all topics and especially this one.
He taught Advaita Vedanta, so it would be a good place to study.
Wikiquotes is good and almost all of his works are online.
https://en.m.wikiquote.org/wiki/Swami_Vivekananda
Here is a beautiful collection of his works:
https://en.m.wikisource.org/wiki/The...mi_Vivekananda
Just click on the Volume and then the topic (Bhakti, Vedanta, etc.)
Now, also remember that these terms occur as well, Bhakti and Jnana, and so forth. While Dvaita and Advaita could be said to be called philosophies, Bhakti and Jnana are the corresponding approaches of these. Bhakti is devotion, and Jnana knowledge.
Best wishes!
Let us know how it goes.
Peace.
"Studying the Bhagavatam is the most peaceful thing you can do." - Sri Ganapati Sachidananda Swami
"The Vedanta recognizes no sin, it only recognizes error." - Swami Vivekananda
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