def get_closing_prices(self, coin_pair, period, unit):
        """
        Returns closing prices within a specified time frame for a coin pair
        :param coin_pair: String literal for the market (ex: BTC-LTC)
        :type coin_pair: str
        :param period: Number of periods to query
        :type period: int
        :param unit: Ticker interval (one of: 'oneMin', 'fiveMin', 'thirtyMin', 'hour', 'week', 'day', and 'month')
        :type unit: str
        :return: Array of closing prices
        :rtype : list
        """
        historical_data = self.Bittrex.get_historical_data(coin_pair, period, unit)
        closing_prices = []
        for i in historical_data:
            closing_prices.append(i["C"])
        return closing_prices