Spencer, J. F. (2007). Science month-by-month, grades 3-8: Practical ideas and activities for teachers and homeschoolers. Jossey-Bass.
Dyfyniad Arddull ChicagoSpencer, Julia Farish. Science Month-by-month, Grades 3-8: Practical Ideas and Activities for Teachers and Homeschoolers. San Francisco: Jossey-Bass, 2007.
Dyfyniad MLASpencer, Julia Farish. Science Month-by-month, Grades 3-8: Practical Ideas and Activities for Teachers and Homeschoolers. Jossey-Bass, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.