In this short note, we get the precise bound for holomorphic cusp forms with respect to the weight just by Weil bound. © 2006 Elsevier Inc. All rights reserved.
Xia, H. (2007). On L∞ norms of holomorphic cusp forms. Journal of Number Theory, 124(2), 325–327. https://doi.org/10.1016/j.jnt.2006.09.003