Gaya APA

Schmitt, C, J., Helstrom, J. (1988). French Illuminations : Workbook/Tape Manual (Ed. WorkBook). USA: McGrawhill.

Gaya MLA

Schmitt, Conrad, J.., Helstrom, Jo. "French Illuminations : Workbook/Tape Manual". Ed. WorkBook USA: McGrawhill, 1988. Text.