Eisenberg J. F., Kuehn R. E., 1966: The behavior of Ateles geoffroyi and related species. 68 pp. 

 Elzen R. van den, Frahnert S., Quaisser C., 2005: A digital catalogue of primary type specimens in German ornitological collections – a three year project running within GBIF – Germany – Vertebrata. 9 pp. Zoologische Mededelingen Leiden 79 (3): 97-105.

 Elzen R. van den, Nemeschkal H. L., 2009: The impact of body mass on morphological integration in avian skeletons (Aves, Fringillidae, Carduelinae, Fringillinae). 11 pp. Bonner zoologische Beiträge 56(2008)(1-2): 25-35.

 Endes M., Horváth L., Hüttler B., 1967: The life history of the Hungarian Short-toed Lark, Calandrella cinerea hungarica Horváth, 1956, in Hortobágy, Hungary. 16 pp. 

 Endes M., Horváth L., Hüttler B., 1967: The life history of the Hungarian Short-toed Lark, Calandrella cinerea hungarica Horváth, 1956, in Hortobágy, Hungary. 16 pp. [AVE 101] Acta zoologica cracoviensia 12/14: 379-391.

 Enemar A., 1963: The density of birds in the subalpine birch forest of the Abisko area Swedish Lapland, in 1961. 21 pp. (in English). Lunds Universitets Arsskrift 58(12): 1-21.

 Érard C., Etchecopar R.-D., 1970: Contribution a l’Étude des oiseaux d’Iran. Résultats de la Mission Etchecopar 1967. 6 plates, 4 maps, 146 pp. Mémoires du Muséum national d’Histoire naturelle (A) 66: Sleva 20%!

 Ericson P. G. P., 2005: Evolution and biogeography of suboscine birds analysed by DNA sequence data – a research program at the Swedish Museum of Natural History. 2 pp. Zoologische Mededelingen Leiden 79 (3): 173-174.

 Eversmann E., 1853: Noch ein kleiner Beitrag zur Mammalogie und Ornithologie des Russischen Reiches. 14 pp. (in German).