Moore, R. C.; Sylvester-Bradley, P. C. (1957). Second supplemental application: Application for a ruling by the International Commission directing that the classification and nomenclature of ammonoid aptychi (Class Cephalopoda) be in terms of "parataxa". Bulletin of Zoological Nomenclature. 15, 35-70.
194544
Moore, R. C.; Sylvester-Bradley, P. C.
1957
Second supplemental application: Application for a ruling by the International Commission directing that the classification and nomenclature of ammonoid aptychi (Class Cephalopoda) be in terms of "parataxa".