Cita APA (7a ed.)

National Centre for Information and Documentation (Bulgaria). (2005). Advances in Bulgarian science. National Centre for Information and Documentation.

Cita Chicago Style (17a ed.)

National Centre for Information and Documentation (Bulgaria). Advances in Bulgarian Science. Sofia: National Centre for Information and Documentation, 2005.

Cita MLA (9a ed.)

National Centre for Information and Documentation (Bulgaria). Advances in Bulgarian Science. National Centre for Information and Documentation, 2005.