@book{Kopp1987,
author="Horst Kopp",
title="Agriculture in Yemen: From Mocca to qat",
year="1987",
booktitle="Yemen: 3000 Years of Art and Civilisation in Arabia Felix",
editor="Werner Daum",
publisher="Pinguin-Verlag",
address="Innsbruck",
pages="368-71",
keyword0="Agriculture",
keyword1="Coffee",
type="chapter"
}