Παραπομπή APA

Schuller ,Robert H. (1988). Tough Times Never Last But Tough People Do. Orient Paperbacks.

Παραπομπή Chicago Style

Schuller ,Robert H. Tough Times Never Last But Tough People Do. Delhi: Orient Paperbacks, 1988.

Παραπομπή MLA

Schuller ,Robert H. Tough Times Never Last But Tough People Do. Orient Paperbacks, 1988.