Gaya APA
W., R, H.
(1955).
Differential Eguations
(
2nd. Ed)
.
London:
New york.John Wiley dan Sons Inc.
Gaya MLA
W., Reddick, Harry.
"Differential Eguations".
2nd. Ed
London:
New york.John Wiley dan Sons Inc,
1955.
Text.