APA (7th ed.) Citation
Durham, B. (1971). Here's how to write a letter: To write better letters. Multiservice.
Chicago Style (17th ed.) Citation
Durham, Boniface. Here's How to Write a Letter: To Write Better Letters. Lusaka: Multiservice, 1971.
MLA (9th ed.) Citation
Durham, Boniface. Here's How to Write a Letter: To Write Better Letters. Multiservice, 1971.
Warning: These citations may not always be 100% accurate.