The Good Therapy, gives a succinct overview of parts work:

https://www.goodtherapy.org/learn-about-therapy/types/internal-family-systems-therapy

This article from the Medium giving a more personal account of how IFS helped a client move towards self acceptance and healing from within:

https://elemental.medium.com/inside-the-revolutionary-treatment-that-could-change-psychotherapy-forever-8be035d54770 

M. Pasterski, looks in greater detail at IFS, highlighting the need for self compassion, he provides comparisons with other modalities and examples of how a session may be conducted:

https://pasterski.com/2018/10/internal-family-systems-meet-your-inner-family/

 I highly recommend the much celebrated― Bessel A. van der Kolk, The Body Keeps the Score: Brain, Mind and Body in the Healing of Trauma.

Based on decades of clinicial experience, Van der Kolk gives a great overview of the where we are with psychotherapy and how that’s changing; crucially, with recognition of the need for more holistic approaches to healing. 

He refers to therapies like IFS as having profoundly positive results. 

This synopsis gives a excellent account of his book with good excerpts:

https://www.brainpickings.org/2016/06/20/the-body-keeps-the-score-van-der-kolk/