Gaya APA
FRAILEY, L.
(1976).
Handbook of business letters
.
Englewood Cliffs, N.J.:
Prentice-Hall.
Gaya MLA
FRAILEY, L.E..
"Handbook of business letters".
Englewood Cliffs, N.J.:
Prentice-Hall,
1976.
Buku.