Lua APA (7ú heag.)

SOMERVILL, B. A. (2006). WILLIAM PENN FOUNDER OF PENNSYLVANIA. COMPASS POINT BOOKS.

Lua i Stíl Chicago (17ú heag.)

SOMERVILL, BARBARA. A. WILLIAM PENN FOUNDER OF PENNSYLVANIA. MINNEAPOLIS: COMPASS POINT BOOKS, 2006.

Lua MLA (9ú heag.)

SOMERVILL, BARBARA. A. WILLIAM PENN FOUNDER OF PENNSYLVANIA. COMPASS POINT BOOKS, 2006.

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