(2015). Grammar explorer 1: Student book. Boston: MA National Geographic Learning Cengage Learning.
シカゴスタイル引用形Grammar Explorer 1: Student Book. Boston: MA National Geographic Learning Cengage Learning, 2015.
MLA引用形式Grammar Explorer 1: Student Book. Boston: MA National Geographic Learning Cengage Learning, 2015.
警告: この引用は必ずしも正確ではありません.