Friedenberg, J., Kennedy, D., Lomperis, A., Martin, W., Westerfield, K., & Naerssen, M. v. (2003). Effective practices in workplace language training: Guidelines for providers of workplace English language training services. Alexandria, Virginia: Teachers of English to Speakers of Other Languages.

Friedenberg, Joan, Deborah Kennedy, Anne Lomperis, William Martin, Kay Westerfield, and Margaret van Naerssen. Effective Practices in Workplace Language Training: Guidelines for Providers of Workplace English Language Training Services. Alexandria, Virginia: Teachers of English to Speakers of Other Languages, 2003.

Friedenberg, Joan, et al. Effective Practices in Workplace Language Training: Guidelines for Providers of Workplace English Language Training Services. Alexandria, Virginia: Teachers of English to Speakers of Other Languages, 2003.