Author Series -- connected books from a single author. The Stephanie Plum series by Janet Evanovich is an example.

  • Bar Cynster
  • Jack Ryan
  • Wheel of Time
  • Fool's Gold
  • In Death

Publisher Series -- series in numerical order that are not necessarily related. Harlequin Presents is an example. Publisher imprints are also included in this category. Zebra Heartfire is an example.

  • Harlequin Rom Sus
  • Harlequin Romance
  • Love Inspired
  • Step Into Reading
  • Love Finds You

Multi-Author Series -- series where the books do connect in some way but are published by several authors. Star Wars is an example.

  • Private (Jack Morgan)
  • Billionaires and Babies
  • Disney's Frozen
  • Warhammer 40,000
  • Wonder Woman