Cita APA (7a ed.)

Langevich, H. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].

Cita Chicago Style (17a ed.)

Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].

Cita MLA (8a ed.)

Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].