Donald Leo Davis’ book The First Seven Ecumenical Councils does an overall good job in describing the Council of Nicaea. I recommend reading this book because it gives some good background information before diving into the Council itself.
It always helps to read the original sources, too. The book The Christological Controversy (or, it may be The Trinitarian Controversy) (both St.Vladimir’s Press) provides letters from Arius, Alexander of Alexandria and others involved in the Nicene debate.
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