Gradus, Y., & Einy, Y. (~ 1981). Trends in core-periphery industrialization gaps in Israel [Book]. Geographical Research Forum, 3 (1981) 25-37, 3 (1981) 25-37.
Chicago Manual of Style 17th edition (author-date)Gradus, Y., ו Yakov Einy. 1981. "Trends in core-periphery industrialization gaps in Israel". Book. Geographical Research Forum, מס’ 3 (1981) 25-37: 3 (1981) 25-37.
Springer - Basic (author-date)Gradus Y, Einy Y (1981) Trends in core-periphery industrialization gaps in Israel. Geographical Research Forum 3 (1981) 25-37
Springer - Lecture Notes in Computer Science1.Gradus, Y., Einy, Y.: Trends in core-periphery industrialization gaps in Israel. Geographical Research Forum. 3 (1981) 25-37 (1981).
DIN 1505-2 (author-date, Deutsch) - standard superseded by ISO-690Gradus, Y. ; Einy, Yakov: Trends in core-periphery industrialization gaps in Israel. בתוך: Geographical Research Forum (1981), Nr. 3 (1981) 25-37, ’עמ 3 (1981) 25-37