APA استشهاد

Robert H Hill. (1993). The Wordsworth dictionary of difficult words. Wordsworth.

استشهاد بنمط شيكاغو

Robert H Hill. The Wordsworth Dictionary of Difficult Words. Hertfordshire: Wordsworth, 1993.

MLA استشهاد

Robert H Hill. The Wordsworth Dictionary of Difficult Words. Wordsworth, 1993.