Lee, Raymond L. (2001). The rainbow bridge : rainbows in art, myth, and science. Alistair B. Fraser. University Park, Pa.: Pennsylvania State University Press. pp. 111–112. ISBN0-271-01977-8. OCLC41951270.
Lee, Raymond L. (2001). The rainbow bridge : rainbows in art, myth, and science. Alistair B. Fraser. University Park, Pa.: Pennsylvania State University Press. pp. 111–112. ISBN0-271-01977-8. OCLC41951270.
Chu, Petra ten-Doesschate (2010). Nineteenth-century European art (3rd ed.). Pearson. p. 175. ISBN9780205707997. OCLC624045291.