Παραπομπή APA

Bittel, L. R. (1976). Improving supervisory performance. Mc Graw-Hill.

Παραπομπή Chicago Style

Bittel, Lester R. Improving Supervisory Performance. Auckland: Mc Graw-Hill, 1976.

Παραπομπή MLA

Bittel, Lester R. Improving Supervisory Performance. Mc Graw-Hill, 1976.