Stephen Nichols booklet What Is Vocation? (Basics of the Faith) is a helpful and quick read on the subject. It helps to remind us that, whatever our work is (ministry work, marketplace work, or working in the home), it is a calling from God and therefore is immensely meaningful when done for the glory of God.
Another helpful read on the doctrine of vocation is Gene Veith’s excellent book God at Work: Your Christian Vocation in All of Life.
And, if you haven’t made the connection already, it’s worth noting: everything that I write on productivity is really a fleshing out of the doctrine of vocation on the practical side.