While there are many good Bible commentaries and Bible studies books available, the space and weight to transport them to Uganda is limited. Therefore, I recommend taking a one volume commentary and the best I know in that field is by Matthew Henry. There are three editions of it listed below. Pick the one you can get the best price on. It is a testimony to Matthew Henry's enduring faithfulness to the Scriptures that we find three publishers all having a one volume edition of his work. If a pastor friend asks you to bring a commentary on a specific book of the Bible, email me and I will be happy to give you one or two recommendations then rather than fill up web space now.