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.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)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.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)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.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.