The third one is MLA format according to Purdue Owl
It is through operant conditioning.
<span>The behaviour shown in operant
conditioning is controlled by the consequences. Every time Eric thinks about
skiing, he remembers his childhood experience of being buried in an avalanche
and is afraid of that incident repeating again. Thinking of that as the
consequence of skiing, Eric does not want to go skiing again and refuses the
invitations.</span>
