(1999). Learn to speak English: Complete interactive English course for non-native speakers. Workbook. Fremont, CA.: The Learning Company.
Chicago-tyylinen lähdeviittausLearn to Speak English: Complete Interactive English Course for Non-native Speakers. Workbook. Fremont, CA.: The Learning Company, 1999.
MLA-viiteLearn to Speak English: Complete Interactive English Course for Non-native Speakers. Workbook. Fremont, CA.: The Learning Company, 1999.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.