Sommer, B., & Pötzsch, O. (2003). Population of Germany Today and Tomorrow. Metzler-Poeschel.
Chicago-Zitierstil (17. Ausg.)Sommer, Bettina, 与 Olga Pötzsch. Population of Germany Today and Tomorrow. Wiesbaden: Metzler-Poeschel, 2003.
MLA-Zitierstil (8. Ausg.)Sommer, Bettina, 与 Olga Pötzsch. Population of Germany Today and Tomorrow. Metzler-Poeschel, 2003.
警告：这些引文格式不一定是100％准确.