APA-referens (7:e uppl.)

Langevich, H. Letter, To: Sister Olya From: Mother Helena Langevich, Nov. 1, 1915.

Chicago-referens (17:e uppl.)

Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, Nov. 1, 1915.

MLA-referens (8:e uppl.)

Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, Nov. 1, 1915.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.