This twofold character of the 'speech-habits' becomes more and more unified, since the two fases always occur together. In each case where the child learns the connection S ® r (for instance, to say 'doll' when he sees his doll, he learns also the connection s ® R (for instance, to reach for his doll or handle it when he hears the word 'doll'). Aftetr he has learned a number of such twofold sets, he develops a habit by which one type always involves the other: as soon as he learns to speak a new word, he is also able to respond to it when he hears others speak it on proper occasion.
- Bloomfield (1935), a pag.31

The infant begins by acquiring the speech-habits of the people who take care of him [...] As time goes on, the range of imitated persons becomes wider; throughout his life, the speaker continues to adopt speech-habits from his fellows. At any moment, his language is a unique composite of habits acquired from various people.
- Bloomfield (1935), a pag.476