APA-referens (7:e uppl.)

Langevich, H. Letter, To: Sister Olya From: Mother Helena Langevich, May 9, 1912.

Chicago-referens (17:e uppl.)

Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, May 9, 1912.

MLA-referens (8:e uppl.)

Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, May 9, 1912.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.