React callback binding error

Question

I have this code in my quotes component:

componentWillMount(){
    QuoteStore.on("newQuoteAdded",this.getQuotes);
}

componentWillUnmount(){
    QuoteStore.removeListener("newQuoteAdded",this.getQuotes);
}

getQuotes(){
    console.log(this);
    this.setState({
        quotes:QuoteStore.getQuotes()
    });
}

An event is emitted when new data is added to the flux store (QuoteStore) like this

addQuote(quote,author){
    const newQuote=new Object();
    const date=Date.now().toString();
    newQuote.id=date;
    newQuote.author=author;
    newQuote.quote=quote;

    this.Quotes.push(newQuote);
    this.emit("newQuoteAdded");
}

I am getting this error when my component actually captures this event :

this.setState is not a function at QuoteStore.getQuotes

Can anyone help, how can I bind my this to Quotes component in getQuotes() callback on event capturing?