Journal issue
Hemming, F.
1957. Part 11. Declaration 32: Clarification of the meaning of Article 21 of the Règles in relation to the authorship to be attributed in certain circumstances to zoological names and to any act taken under other provisions of the Règles affecting the status of such names. Ops. Decls. int. Comm. zool. Nomencl. 16, 14 Jun 1957: xi-xxiv.