Spengler, J. J. (1975). Zero population growth: Implications. Carolina Population Center, University of North Carolina at Chapel Hill.
Цитирование в стиле Чикаго (17-е изд.)Spengler, Joseph John. Zero Population Growth: Implications. Chapel Hill: Carolina Population Center, University of North Carolina at Chapel Hill, 1975.
Цитирование MLA (9-е изд.)Spengler, Joseph John. Zero Population Growth: Implications. Carolina Population Center, University of North Carolina at Chapel Hill, 1975.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.