Langevich, H. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].
Chicagoスタイル(17版)引用形式Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].
MLA(8版)引用形式Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].
警告: この引用は必ずしも正確ではありません.