Teaching Business Writing - I need a textbook for GTA's

Hi all --

I'm very pleased to join WPA and hope to connect with colleagues who face similar challenges.

I will again be training a group of GTA's, who are currently teaching FYC (first year comp), in how to teach business writing, and I would like to find a textbook that will help them.

For their FYC practicum we used Wilhoit's Allen & Bacon Handbook for Teaching Assistants, but I haven't found a comparable book for training GTA's to teach business writing.

I would love to hear what others have used.

Thanks,

Sara Jameson Oregon State University