Langdell RD، Wagner RH، Brinkhous KM (1953). "Effect of antihemophilic factor on one-stage clotting tests; a presumptive test for hemophilia and a simple one-stage antihemophilic factor assy procedure". J. Lab. Clin. Med. ج. 41 ع. 4: 637–47. PMID:13045017.