Eremin, E. A. (2017). Educational multiprocessor simulator “E14” and its usage for expanding the formula of Amdahl’s Law[Conference presentation]. 2017 25th Euromicro International Conference on Parallel, Distributed, and Network-Based Processing (PDP), 241–245.
This resource will help you understand more about Amdahl’s law.
Al-hayanni, M. A. N., Xia, F., Rafiev, A., Romanovsky, A., Shafik, R., & Yakovlev, A. (2020). Amdahl’s law in the context of heterogeneous many-core systems – a survey. IET Computers & Digital Techniques, 14(4), 133.
This resource compares Amdahl’s and Gustafson laws for heterogenous core processors.