Droogmans, J. (1959). In memoriam Professor Mr. J.-H.-Paul Bellefroid. S.l.: s.n.
Chicagoスタイル(17版)引用形式Droogmans, Jozef. In Memoriam Professor Mr. J.-H.-Paul Bellefroid. S.l.: s.n, 1959.
MLA(8版)引用形式Droogmans, Jozef. In Memoriam Professor Mr. J.-H.-Paul Bellefroid. S.l.: s.n, 1959.
警告: この引用は必ずしも正確ではありません.