Friedenberg, J. E., Kennedy, D., Lomperis, A., Martin, W., & Westerfield, K. (2003). Effective practices in workplace language training: Guidelines for providers of workplace english language training services. Alexandria, Virginia: Teachers of english to speakears of other languages.

Friedenberg, Joan E.,, Deborah Kennedy, Anne Lomperis, William Martin, and Kay Westerfield. Effective Practices in Workplace Language Training: Guidelines for Providers of Workplace English Language Training Services. Alexandria, Virginia: Teachers of english to speakears of other languages, 2003.

Friedenberg, Joan E.,, et al. Effective Practices in Workplace Language Training: Guidelines for Providers of Workplace English Language Training Services. Alexandria, Virginia: Teachers of english to speakears of other languages, 2003.