| ▲Título▼ | ▲C▼ | △Año▼ | ▲V▼ | ▲Concepto▼ |
|---|---|---|---|---|
| The Plot Is the Thing |   | 1966 | — | Escritor |
| Introduction (to "The Disciples of Cthulhu") |   | 1976 | 8.00 | Escritor |
| Closer of the Way |  | 1977 | — | Escritor |
| Strange Eons |  | 1978 | — | Escritor |
| Afterword (to "Mysteries of the Worm") |  ? | 1981 | — | Escritor |
| Heritage of Horror |  | 1984 | — | Escritor |
| An Open Letter to H.P. Lovecraft |  | 1990 | — | Escritor |
| The Bedspots of Life | | 1991 | — | Escritor |
| The Creative Urge | | 1991 | — | Escritor |
| The Grab Bag (junto a Henry Kuttner) | | 1991 | — | Escritor |
| A Eulogy for the Church of "The Haunter of the Dark" | ? | 1992 | — | Escritor |
| Preface (to "Tales of the Lovecraft Mythos") | ? | 1992 | — | Escritor |
