Since 1630, cardinals have taken the style Eminence. In accordance with Latin tradition, they sign by placing the title Cardinalis (abbreviated Card.) after their personal name and before their surname as, for instance, "John Cardinal Doe". Similarly, the official signature of popes inserts the Latin title Papa (abbreviated Pp. immediately after the personal name, as "Benedictus Pp. XVI" for Pope Benedict XVI. Some writers, such as James-Charles Noonan, hold that, in the case of cardinals, the form used for signatures should be used also when referring to them, even in English; and this is the usual but not the only way of referring to cardinals in Latin. However, influential stylebooks indicate that the correct form for referring to a cardinal in English is as "Cardinal . This is also th