[NTG-context] Official diary of countries, EU, regions, etc.

Hi, I have to use BIBTEX for putting official diary entries (for example the official diary of EU: http://eur-lex.europa.eu/JOIndex.do?ihmlang=en). Typically it has Title, Day, Month, Year, Number of Entry, Type of diary (Official diary of EU, Boletín Oficial del Estado (boe.es), ...). I want to bibtex display this items, like "title", type of diary (day, month, year). Number of entry. How can I achieve this? With options, I think @misc is the best option, but I don't know how to put and format this items. Thanks a lot, Xan.