APA (7th ed.) Citation

Knoblock, J. (1994). A literature guide for William Shakespeare's Macbeth. ECS Learning Systems.

Chicago Style (17th ed.) Citation

Knoblock, Jennifer. A Literature Guide for William Shakespeare's Macbeth. San Antonio, TX: ECS Learning Systems, 1994.

MLA (9th ed.) Citation

Knoblock, Jennifer. A Literature Guide for William Shakespeare's Macbeth. ECS Learning Systems, 1994.