Wanat, M. (2001) Genera of Australo-Pacific Rhadinocybinae and Myrmacicelinae, with biogeography of the Apionidae (Coleoptera: Curculionoidea) and phylogeny of the Brentidae (s. lato). Mantis, Olsztyn, 432 pp - many, many information about preparation techniques, mesurements, morphological characters and terms. Very usefull :)
Alonso-Zarazaga, M.A. (1990) Revision of the supraspecific taxa in the palearctic Apionidae Schoenherr, 1823 (Coleoptera, Curculionoidea). 2. Subfamily Apioninae Schoenherr, 1823: introduction, keys and description. Graellsia, 46, 19–159. - basic publication if you want study Palearctic apionids.