Amherd-Hoekstra A, Näher H, Lorenz HM, Enk AH (May 2010). “Psoriatic arthritis: a review.”. 《Journal of the German Society of Dermatology》 8 (5): 332–9. doi:10.1111/j.1610-0387.2009.07334.x. PMID20015187.
Amherd-Hoekstra A, Näher H, Lorenz HM, Enk AH (May 2010). “Psoriatic arthritis: a review.”. 《Journal of the German Society of Dermatology》 8 (5): 332–9. doi:10.1111/j.1610-0387.2009.07334.x. PMID20015187.