Idem ("the same") is a Latin word used in Spanish with the same meaning, but only in cultured or technical texts, although in many cases with the abbreviation for the Castilianized version ditto: id. .
Ibid ( from the Latin ibidem, abbreviated ib or ibid. ) It is a Latin cultismo which means "in the same place" and is used in citations or notes to a text to refer to a source that was already declared in the appointment. In this context means ' just like the previous reference ' to avoid repeating the reference that has already been stated.