Gaya APA
King, F.W.. ().
Engglish business letters-new edition .
Singapura:
Longman.
Gaya Chicago
King, F.W..
Engglish business letters-new edition.
Singapura:
Longman,
.
Text.
Gaya MLA
King, F.W..
Engglish business letters-new edition.
Singapura:
Longman,
.
Text.
Gaya Turabian
King, F.W..
Engglish business letters-new edition.
Singapura:
Longman,
.
Print.