1. Antinoff, N., Chen S. Viruses. In: Avian Jeopardy-Round 2: Unique Features and Diseases of Birds. Proc Annu Conf Assoc Avian Vet, 2010, p. 185-186.
2. Avian Biotech. Psittacine Beak and Feather Disease. Avian Biotech www.avianbiotech.com, 2016.
3. Clubb S., et al. Feather Damaging Behavior in Lories and its Disassociation with Psittacine Circovirus. Proc Annu Conf Assoc Avian Vet, 2004, p. 319-320.
4. Dahlhausen R. Viral Disease of Pet Birds—Parts 1 and 2. NAVC Conference, 2010, P. 1.2.
5. Dahlhausen R., Radabaugh S. Current Concepts on Psittacine Beak and Feather Disease and Avian Polyomavirus. Old World Aviaries: PBFD and APV, 1998, Old World Aviaries.
6. Dahlhausen R., Radabaugh C.S. Molecular Based Diagnostics: New Insights into PBFD and Avian Polyomavirus. Proc Annu Conf Assoc Avian Vet, 1997.
7. Dahlhausen R., Radabaugh S. Update on Psittacine Beak and Feather Disease and Avian Polyomavirus Testing. Proc Annu Conf Assoc Avian Vet, 1993, p. 6.
8. Faye S. Psittacine Beak and Feather Disease. Beauty of Birds website www.beautyofbirds.com/PBFD.html.
9. Macwhirter P., Cross G. Beak and Feather Disease. Crookwell Veterinary Hospital. Crookwellvet.com.au.
10. Pendle H., Tizard I. Immunology In: Current Therapy in Avian Medicine and Surgery. Brian Speer, Ed., Elsevier Pub. p. 420, 421. - Available from amazon.com -
11. Petcha. PBFD Review, 2005. Petcha. www.petcha.com/pbfd-review-2005.
12. Phalen D.N. Implications of Viruses in Clinical Disorders. In: Harrison G.J. and Lightfoot T.L. (Eds.), Clinical Avian Medicine. Ithaca: International Veterinary Information Service (www.ivis.org), 2010; Document No. A3839.0610. International Veterinary Information Service www.ivis.org/advances/harrison/chap32/chapter.asp?LA=1
13. Pyne M. Psittacine Beak and Feather Disease. Natl Wildlife Rehab Conf 2005, pg. 1-4.
14. Raidal S. Psittacine Beak and Feather Disease. In: Current Therapy in Avian Medicine and Surgery. Brian Speer, Ed., Elsevier Pub. p. 51-57. - Available from amazon.com -
15. Rinder M., Schmitz A., Peschel A., Wörle B., Gerlach H., Korbel R. Molecular characterization of a recently identified Circovirus in zebra finches (Taeniopygia guttata) associated with immunosuppression and opportunistic infections. Avian Pathol. 2017; 46(1): 106-116. - PubMed -
16. Ritchie B. Psittacine Beak and Feather Disease. Pet. Place. www.PetPlace.com, 2014.
17. Speer B., et al. Common Conditions of Commonly Held Companion Birds in Multiple Parts of the World. In: Current Therapy in Avian Medicine and Surgery. Brian Speer, Ed., Elsevier Pub. P. 790. - Available from amazon.com -
18. Van Zeeland Y., Friedman S., Bergman L. Behavior: Testing. In: Current Therapy in Avian Medicine and Surgery, Brian Speer, Ed. Elsevier Pub. p. 203, 229. - Available from amazon.com -
19. Wikipedia: Psittacine Beak and Feather Disease. en.wikipedia.org/wiki/Psittacine_beak_and_feather_disease.