Electronic reproduction. [Place of publication not identified] : HathiTrust Digital Library, 2010.
Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002. http://purl.oclc.org/DLF/benchrepro0212
Mode of access: World Wide Web.
Articles in Spanish, with contributions in English and German.
Año 1, núm. 1 (1942); title from PDF title page (PAO, viewed Feb. 26, 2013).
Vol. 37, núm. 1 (2012) (ProQuest, viewed Mar. 11, 2013).