1. Bakke, T. A.: Reighardia sternae (Diesing, 1864) Ward, 1899 (Pentastomida; Cephalobaenida) from the Common Gull (Larus canus L.) in a Norwegian Locality. Norw. J. Zool. 20 (1972)
2. Burstone, M. S.: Histochemical demonstration of acid phosphatase with naphtol AS-phosphates. J. nat. Cancer Inst. 21, 523?539 (1958)
3. Diesing, K. M.: Revision der Cephacotyleen. S.-B. Akad. Wiss. Wien, math.-nat. Kl. 48, 49 (1864)
4. Doucet, J.: Contribution a l'étude anatomique, histologique and histochemique des pentastomes. Mém. ORSTOM 14, 1?150 (1965)
5. Esslinger, J. H.: Development of Porocephalus crotali (Humboldt, 1808) (Pentastomida) in experimental intermediate hosts. J. Parasit. 48, 452?456 (1962)