Vissh mashinno-elektrotekhnicheski institut "V.I. Lenin.". (1972). Nauchna sesi︠i︡a, posvetena na 150-godishninata ot rozhdenieto na Fridrikh Engels. Institut.
Chicagoスタイル(17版)引用形式Vissh mashinno-elektrotekhnicheski institut "V.I. Lenin.". Nauchna Sesi︠i︡a, Posvetena Na 150-godishninata Ot Rozhdenieto Na Fridrikh Engels. Sofi︠i︡a: Institut, 1972.
MLA(8版)引用形式Vissh mashinno-elektrotekhnicheski institut "V.I. Lenin.". Nauchna Sesi︠i︡a, Posvetena Na 150-godishninata Ot Rozhdenieto Na Fridrikh Engels. Institut, 1972.
警告: この引用は必ずしも正確ではありません.