Langevich, H. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].
Lua i Stíl Chicago (17ú heag.)Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].
Lua MLA (8ú heag.)Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.