Robertson, C. (2013). Safety, nutrition, & health in early education (5th ed., International ed.). Wadsworth/Cengage Learning.
Cita Chicago (17th ed.)Robertson, Cathie. Safety, Nutrition, & Health in Early Education. 5th ed., International ed. Australia: Wadsworth/Cengage Learning, 2013.
Cita MLA (9th ed.)Robertson, Cathie. Safety, Nutrition, & Health in Early Education. 5th ed., International ed. Wadsworth/Cengage Learning, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.