Strong, R. P. Some questions relating to virulence of micro-organisms, with particular reference to their immunizing powers [microform]. Photoduplication Service. University of the Philippines Library.
Chicago-referens (17:e uppl.)Strong, Richard Pearson. Some Questions Relating to Virulence of Micro-organisms, with Particular Reference to Their Immunizing Powers [microform]. Quezon City: Photoduplication Service. University of the Philippines Library.
MLA-referens (9:e uppl.)Strong, Richard Pearson. Some Questions Relating to Virulence of Micro-organisms, with Particular Reference to Their Immunizing Powers [microform]. Photoduplication Service. University of the Philippines Library.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.