When you use a figure in your paper that has been adapted or copied directly from another source, you need to reference the original source. This reference appears as a caption underneath the figure that you copied or adapted for your paper.
Any image that is reproduced from another source also needs to come with copyright permission; it is not enough just to cite the source.
Figures from a Book
Figure X. Descriptive phrase that serves as title and description. Reprinted [or adapted from Book Title (page number), by Author First Initial. Second Initial. Surname, Year, Place of Publication: Publisher. Copyright [Year] by the Name of Copyright Holder. Reprinted [or adapted] with permission.