Langevich, H. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].
Čikaški stil citiranja (17. izdanje)Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].
MLA način citiranja (8. izdanje)Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, [n.d.].
Upozorenje: Ovi citati možda nisu uvijek 100% točni.