Gaya APA
Eckersley, C., Kaufmann, W.
(1954).
English and American business letters
(
1)
.
London:
Longman Goup Limited.
Gaya MLA
Eckersley, C.E.., Kaufmann, W..
"English and American business letters".
1
London:
Longman Goup Limited,
1954.
Text.