Gaya APA
SIMMONS, G, F. (1991).
DIFFERENTIAL EQUATIONS WITH APPLICATIONS AND HISTORICAL NOTES (SECOND).
United States of America:
Mc Graw Hill.
Gaya MLA
SIMMONS, GEORGE, F..
"DIFFERENTIAL EQUATIONS WITH APPLICATIONS AND HISTORICAL NOTES".
SECOND
United States of America:
Mc Graw Hill,
1991.
Text.