El-Shakaa, S. M. A. und Shahein, A. (1989) „Changes with Age in Amino Acids and some Mineral Constituents of Worker Honeybees“., Beiträge zur Entomologie = Contributions to Entomology, 39(1), S. 175–180. doi: 10.21248/contrib.entomol.39.1.175-180.