Lua APA (7ú heag.)

SHEPHERD, J. F. (1987). College vocabulary skills.-- Ed.3. Houghton Mifflin.

Lua i Stíl Chicago (17ú heag.)

SHEPHERD, James F. College Vocabulary Skills.-- Ed.3. Boston: Houghton Mifflin, 1987.

Lua MLA (9ú heag.)

SHEPHERD, James F. College Vocabulary Skills.-- Ed.3. Houghton Mifflin, 1987.

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