Gaya APA
Calvert, S., Calvert, P. (1990).
Latin America in the twentieth century / Peter Calvert, Susan Calvert .
:
The Macmillan Press.
Gaya MLA
Calvert, Susan., Calvert, Peter.
"Latin America in the twentieth century / Peter Calvert, Susan Calvert".
:
The Macmillan Press,
1990.
Textbook.