Παραπομπή APA

Sperry, P. (1928). Short course in spherical trigonometry. Richmond: Johnson Publishing Company.

Παραπομπή Chicago Style

Sperry, Pauline. Short Course in Spherical Trigonometry. Richmond: Johnson Publishing Company, 1928.

Παραπομπή MLA

Sperry, Pauline. Short Course in Spherical Trigonometry. Richmond: Johnson Publishing Company, 1928.

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