protolanguage
suomi-englanti sanakirjaprotolanguage englanniksi
(alternative form of).
{{quote-book|en|year=1994|author=Steven Pinker|title=The Language Instinct|page=366|isbn=0140175296
(alternative form of).
{{quote-book|en|year=1994|author=Steven Pinker|title=The Language Instinct|page=366|isbn=0140175296