(2010). RosettaStone English: Teacher's guide (Classroom version 3). Harrisonburg, VA: Rosetta Stone.
Chicago ZitierstilRosettaStone English: Teacher's Guide (Classroom Version 3). Harrisonburg, VA: Rosetta Stone, 2010.
MLA ZitierstilRosettaStone English: Teacher's Guide (Classroom Version 3). Harrisonburg, VA: Rosetta Stone, 2010.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.