小写，因为“and”是个并列连词。你可以看下下面的，讲的很详细。
英文写作标题大小写规则(zz)2010-03-16 22:16不同的出版物会有不同的要求。如果你要投稿的话，最好先向编辑咨询。
这里介绍一下平时的（也就是你问题中的）格式，你的问题中，a应该小写，因为是冠词，from应该小写，因为是prep. <5 letters.
因为规则比较多，先讲一下记的方法：...that the first word and all the 'main' words in a title should have initial capitals, and all the 'joining' words should be left in lower case, e.g.: To Be, or Not to Be, That is the Question." "Business Case for Selling Fridges to Eskimos."
以下是rules:
1. Always capitalize the first and the last word, regardless of their part of speech ("The Text to Look For").
2. Capitalize all nouns, pronouns (including its), adjectives (including this and that作为形容词时), verbs (including is and other forms of to be), adverbs (including than and when作为副词), and subordinate conjunction("as", "because", "although", "before", "after", "when作为连词"...).
3. Lowercase all articles (a, an, the) unless an article is the
first word in the title; Lowercase all coordinate conjunction("and", "or", "nor", "for", "but"), and prepositions regardless of length, when they are other than the first or last word.
——注：preposition的话，更常用的是像二楼的说法，do not capitalize prepositions with fewer than five letters. 也就是说between要大写。
But do capitalize prepositions that are part of a verb phrase ("Backing Up Your Disk").
4. Lowercase the "to" in an infinitive (when it precedes a verb) ("How to Format Your Hard Disk").
5. Capitalize the second word in compound words if it is a noun or proper adjective or the words have equal weight (Cross-Reference, Pre-Microsoft Software, Read/Write Access, Run-Time).
6. Do not capitalize the second word if it is another part of speech or a participle modifying the first word (How-to, Take-off)
7. First word following a colon (:)
Finally, the following bit of advice:
"There are many modern style guides and they are much more liberal than the traditional ones: you can make your own decision what you can do, what you want to do.
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