APA
Nilsen A. P., Nilsen D. L. F., . (2004). Vocabulary plus high school and up : a source-based approach. Boston: Pearson.
Chicago
Nilsen Alleen Pace, Nilsen Don L F, . 2004. Vocabulary plus high school and up : a source-based approach. Boston: Pearson.
Harvard
Nilsen A. P., Nilsen D. L. F., . (2004). Vocabulary plus high school and up : a source-based approach. Boston: Pearson.
MLA
Nilsen Alleen Pace, Nilsen Don L F, . Vocabulary plus high school and up : a source-based approach. Boston: Pearson. 2004.