Não informado. Forthcoming International Scientific and Technical Conferences. Department of Education and Science.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Forthcoming International Scientific and Technical Conferences. London: Department of Education and Science.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Forthcoming International Scientific and Technical Conferences. Department of Education and Science.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.