Galvin, Thomas J.. Reference services and Libraries. U: Encyclopedia of Library and Information Science. New York: Marcel Dekker, 1978, vol 25, pp. 210-226. Grogan, Denis. Practical Reference Work, London: Clive Bingley, 1979. Cullen, Rowena. Only connect... a survey of refernce service - past, present and future. U: Information Services in an Electronic Environment. International Yearbook of Library and Information Management 2001/2002. Lanham, Maryland: Scarecrow Press, 2001, pp. 3-42 Katz, W.A.. Introduction to Reference Work. Vol.2, Reference service. New York: McGraw-Hill, 1969. Higgens, Gavin L.. Printed Reference Material. London: Library Association, 1984. Kašić, Smiqka. Od jednog priričnika do referensne zbirke. U: Spomenica 1832- 1982. Beograd: Narodna biblioteka Srbije, 1985, str. 257-274. Đaja, Ivanka. Priručnici u novoj zgradi Narodne biblioteke Srbije.U: Godišnjak 1978. Beograd: Narodna biblioteka Srbije, 1979, str. 311-315. Rajčević, Dušica. Centar za pravne informacije Narodne biblioteke Srbije. U: Glasnik Narodne biblioteke Srbije, 2002, str.363-368.