In some cases you may want to refer to an illustration, image or photo in a book or to the information in the caption. Treat these just as you would written text. The following example is of an unnamed piece of sixties art, which has a strong reference back to the drawings of Aubrey Beardsley.
The mid 1960s saw a revivial of interest in, and reference back to, artwork from the end of the previous century, for example the drawings of Aubrey Beardsley (Gorman, 2001, p. 69).
Gorman, P. (2001). The look: adventures in pop & rock fashion. London : Sanctuary Publishing
An image that has an author/creator and date:
Some of the excitement and alarm that rail travel caused are captured by Turner (1844) in his painting of the Great Western Railway.
Turner, J. (1844). Rain, steam, and speed - The Great Western Railway [image]. Retrieved from http://www.nationalgalleryimages.co.uk/.
An image that has no author/creator and no date:
This photograph " Aero grass" captures the varieties of green in the grass (Aero grass, n.d.).
Aero grass.(n.d.). [photograph] Neo Smart Image Gallery. Retrieved from http://neosmart.net/gallery/v/wallpapers/Vista/LH/Aero+Grass.jpg.html.