Berenstain, S., & Berenstain, J. (1968). The bears' vacation. Beginner Books.
Cita Chicago Style (17a ed.)Berenstain, Stan, y Jan Berenstain. The Bears' Vacation. [New York]: Beginner Books, 1968.
Cita MLA (8a ed.)Berenstain, Stan, y Jan Berenstain. The Bears' Vacation. Beginner Books, 1968.
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