Template:Watson, 2019
- Watson, J.M. 2019. Lest we forget. A new identity and status for a Viola of section Andinium W. Becker; named for an old and treasured friend and companion. Plus another ... International Rock Gardener 117: 3–56. PDF (First version, with validation of Viola wikipedia) PDF (Corrected version, Viola wikipedia was deleted and replaced by V. angustifolia).