APA ציטוט
(1981). Science year :1981: The World book science annual. Field Enterprises Educational Corporation.
Chicago Style (17th ed.) Citation
Science Year :1981: The World Book Science Annual. Chicago: Field Enterprises Educational Corporation, 1981.
ציטוט MLA
Science Year :1981: The World Book Science Annual. Field Enterprises Educational Corporation, 1981.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.