Use of the Waxholm Space Atlas of the Sprague Dawley Rat Brain requires citation of the first publication (Papp et al., 2014) and, when relevant, any of the later publications.

Atlas version v1.00 - Papp et al. 2014
Papp EA, Leergaard TB, Calabrese E, Johnson GA, Bjaalie JG (2014) Waxholm Space atlas of the Sprague Dawley rat brain. NeuroImage 97, 374-386.
DOI: 10.1016/j.neuroimage.2014.04.001

Papp EA, Leergaard TB, Calabrese E, Johnson GA, Bjaalie JG (2015) Addendum to "Waxholm Space atlas of the Sprague Dawley rat brain" [NeuroImage 97 (2014) 374-386]. NeuroImage 105, 561–562.
DOI: 10.1016/j.neuroimage.2014.10.017

Atlas version v2.00 - Kjonigsen et al. 2015
Kjonigsen LJ, Lillehaug S, Bjaalie JG, Witter MP, Leergaard TB (2015) Waxholm Space atlas of the rat brain hippocampal region: Three-dimensional delineations based on magnetic resonance and diffusion tensor imaging. NeuroImage 108, 441-449.
DOI: 10.1016/j.neuroimage.2014.12.080

Atlas version v3.00 - Osen et al. 2019
Osen KK, Imad J, Wennberg AE, Papp EA, Leergaard TB (2019) Waxholm Space atlas of the rat brain auditory system: Three-dimensional delineations based on structural and diffusion tensor magnetic resonance imaging. NeuroImage 199, 38-56. 
DOI: 10.1016/j.neuroimage.2019.05.016