Âåëèêà Ðàäÿíñüêà Åíöèêëîïåä³ÿ
"ѳìåéíà ôåðìà", äèâ. â ñò. Ôåðìåðñüêå ãîñïîäàðñòâî , "Ñò³éêîñò³ ñ³ìåéíèõ ãîñïîäàðñòâ (ôåðì)" òåîð³ÿ .