A complicating factor has been the continuing lack of specialized one-volume reference works on Asian Americans, such as biographical dictionaries or desktop encyclopedias.

一个复杂的因素是，一直缺乏专门针对亚裔美国人的一卷参考著作，如传记词典或台式百科全书。

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Surely reference works need to be compiled by experts?

参考书一定要由专家编写么？

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In scientific disciplines, a student begins by studying general reference works such as text books.

在科学学科中，学生首先从研究通用的参考材料比如课本开始。

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Users can also peruse more than 150 supplementary texts, ranging from reference works to contemporary reviews of Darwin's books, obituaries and recollections.

BBC: NEWS | Science/Nature | Charles Darwin's works go online

He saw these drawings as documentary and reference material, not as works of art.

WSJ: Ancient Modernism | 'Louis Kahn: The Power of Architecture' | Vitra Design Museum, Germany | By Colin Amery

Its third great achievement is the breadth and thoroughness of its reference, thousands of entries on writers and their works which combine authority and detail with insight.

ECONOMIST: Fantasists