Gaya APA
Sherbert, R., G., D., R. (1992).
INTRODUCTION TO REAL ANALYSIS (Second Edition).
New York:
John Willey & Sons, Inc.
Gaya MLA
Sherbert, Robert, G.Bartle,, Donald, R..
"INTRODUCTION TO REAL ANALYSIS".
Second Edition
New York:
John Willey & Sons, Inc,
1992.
Buku Inti.