Gaya APA
EL-SWAIFY, S, A. (1985).
SOIL EROSION AND CONSERVATION .
United States of America:
Library of Congress Cataloging in Publication Data.
Gaya MLA
EL-SWAIFY, S., A..
"SOIL EROSION AND CONSERVATION".
United States of America:
Library of Congress Cataloging in Publication Data,
1985.
Text.