| GOST | Koval B. A farewell letter to a Teacher and Friend // Latinskaia Amerika. – 2015. – Issue 11 C. 104-105 . |
|---|---|
| MLA | Koval, Boris "A farewell letter to a Teacher and Friend." Latinskaia Amerika. 11 (2015).:104-105. |
| APA | Koval B. (2015). A farewell letter to a Teacher and Friend. Latinskaia Amerika. no. 11, pp.104-105 |
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