The consulted sources
When the Conjugator TIP shows the conjugation, also it shows aditional information that is drawn from consulted sources and referred with the follow abbreviations:
NGLE-RAE-2009. New grammar of Spanish language. Espasa Calpe (2009)
BD-IVH-2006. Data Base of Hispanic Verblogy Institute - version 13.0 (2006)
DPD-RAE-2005. Pan-Hispanic dictionary of doubts of Royal Spanish Academy - 1th edition (2005)
DLE-RAE-2001. Spanish language dictionary of Royal Spanish Academy - 22th edition (2001)
DLE-RAE-WEB. Diccionario de la lengua española de la Real Academia Española - en línea
The Conjugador TIP does not show the source for every verb, because of there is many verbs without problem in their conjugation and every source offers the same information.