P.Pickett William. (2004). Leaders of the Americas 2. American: McGraw -Hill.
Trích dẫn kiểu ChicagoP.Pickett William. Leaders of the Americas 2. American: McGraw -Hill, 2004.
MLA引文P.Pickett William. Leaders of the Americas 2. American: McGraw -Hill, 2004.
警告:这些引文格式不一定是100%准确.