Langevich, H. Letter, To: Sister Olya From: Mother Helena Langevich, December 10, 1915.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLangevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, December 10, 1915.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLangevich, Helena. Letter, To: Sister Olya From: Mother Helena Langevich, December 10, 1915.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.