Παραπομπή σε μορφή APA (7η εκδ.)

Langevich, H. Letter, To: Sister Olya From: Mother Helena Langevich, May 13, 1912.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, May 13, 1912.

Παραπομπή σε μορφή MLA (8th εκδ.)

Langevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, May 13, 1912.