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Coventry, A.J. (1970). "Reptile and amphibian type specimens housed in the National Museum of Victoria". Memoirs of the National Museum of Victoria. 31: 115–124. doi:10.24199/j.mmv.1970.31.13. P. l. howitii is on page 117
Coventry, A.J. (1970). "Reptile and amphibian type specimens housed in the National Museum of Victoria". Memoirs of the National Museum of Victoria. 31: 115–124. doi:10.24199/j.mmv.1970.31.13. P. l. howitii is on page 117