NL100 ATs standard river situation

[Oct0puz]

Just checking up a pretty standard hand.

Pacific Hand History Converter Tool from Fuzzy\'s Logic vs Poker
(Format: 2+2 Forums)

EP ($127.7)
Hero ($99)
CO ($92.82)
Button ($44.5)
SB ($21.14)
BB ($100)

Villain is unknown

Preflop: Hero is LP with A[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img]
Hero raises $4, <font color="#666666">1 fold</font>, CO calls $4, <font color="#666666">3 folds</font>,

Flop: 9[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img] ($9.0)
<font color="#CC3333">Hero bets $6</font>, CO calls $6,

Turn: 6[img]/images/graemlins/heart.gif[/img] ($20.5)
<font color="#CC3333">Hero bets $11</font>, CO calls $11,

River: J[img]/images/graemlins/club.gif[/img] ($41)
Hero bets how much?

And is my turn bet too small?