Two books I found very good for inductor/transformer design and core selections are written by C. W. Mclyman:

1. Mclyman, C. W. M. T. (2004). Transformer and Inductor Design Handbook, (Third Edition) Marcel Dekker, Inc, 5(3)-5(20)

2. T. Mclyman, C. W. (1997). Magnetic Core Selection for Transformers and Inductors A User’s Guide to Practice and Specification (Second Edition). Taylor & Francis Group, 69, 93.

3. In my M.S thesis project, I worked on transformer design, and the thesis book titled, "Design, Analysis, and Simulation of an Isolated High Voltage DC Power Supply Based on Modular Converter and Cockcroft-Walton Voltage Multiplier Topology" is available in research gate. Although it is about transformer, many calculation shown on the book are also applicable for inductor design. Step by Step calculation for magnetic design is given there.

4. Sometimes, you will find application note, data sheet, core selection chart from the website of the magnetic core manufacture like FERROXCUBE, TDK. Those documents may also become helpful.

Hope these resources/ references will help. Best of luck.