Gaya APA
Riebel, J, P. (1974).
How to write successful business letters in 15 days .
Bombay:
D.B. Taraporevala Sons r Co.
Gaya MLA
Riebel, John, P..
"How to write successful business letters in 15 days".
Bombay:
D.B. Taraporevala Sons r Co,
1974.
Buku.