Gaya APA

RIEBEL, J, P. (1974). HOW TO WRITE SUCCESSFUL BUSINESS LETTERS IN 15 DAYS . Bombay: D. B. TARAPOREVALA SONS & CO. PRIVATE LTD..

Gaya MLA

RIEBEL, John, P.. "HOW TO WRITE SUCCESSFUL BUSINESS LETTERS IN 15 DAYS". Bombay: D. B. TARAPOREVALA SONS & CO. PRIVATE LTD., 1974. Textbook.