KDP categories · Top KDP authors
Reference (Java, Books): Amazon KDP category data
Amazon Books Best Sellers data for Reference (Java, Books), updated Nov 2, 2026: median price $22.99, median 3 reviews, average rating 4.2 and a KDPTop opportunity score of 23/100 (highly competitive).
| Price range (middle 50%) | $15.90 – $30 |
|---|---|
| Average rating | 4.2 |
| New releases (90 days) | 9% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 6% of the parent category Java (48), one of the easier corners under it.
- Its review barrier is lower than in 94% of Books categories: the median best seller has only 3 reviews, so new books can chart with few.
- At $22.99 its median price beats 81% of Books categories, leaving more margin per copy.
Top 10 Reference best sellers
-
Head First Java: A Brain-Friendly Guide
by Kathy Sierra
- List rank#1
- Price$43.99
- Rating4.6
- Reviews699
-
Java Programming Language: a QuickStudy Laminated Reference Guide
by Robin Nixon
- List rank#2
- Price$8.95
- Rating4.5
- Reviews228
-
Java in a Nutshell: A Desktop Quick Reference
by Benjamin J. Evans
- List rank#3
- Price$59.99
- Reviews-
-
Java: The Complete Reference, Thirteenth Edition
by Herbert Schildt
- List rank#4
- Price$37.59
- Rating4.9
- Reviews98
-
Java with Generative AI: a QuickStudy Laminated Reference Guide
by Robin Nixon
- List rank#5
- Price$8.95
- Rating5.0
- Reviews3
-
Java: Learn Java in One Day and Learn It Well. Java for Beginners with Hands-on Project. (Learn Coding Fast with Hands-On Project)
- List rank#6
- Price$11.67
- Rating4.5
- Reviews953
-
Murach's Java Programming: Training & Reference
by Joel Murach
- List rank#7
- Price$36.98
- Rating4.7
- Reviews42
-
Java Api Reference
by Colin Fraizer
- List rank#8
- Price-
- Rating3.6
- Reviews2
-
Elements of Programming Interviews in Java: The Insiders' Guide
by Adnan Aziz
- List rank#9
- Price$19.24
- Rating4.6
- Reviews497
-
Java in a Nutshell: A Desktop Quick Reference
by Benjamin J. Evans
- List rank#10
- Price$44.94
- Rating4.3
- Reviews18
FAQ
Is Reference a good niche for Amazon KDP?
Its KDPTop opportunity score is 23/100, which makes it highly competitive. The median best seller has 3 reviews and sells for $22.99.
How many reviews do you need to rank in Reference?
The median best seller has 3 reviews, and 84% of them have fewer than 100.
What do Reference best sellers cost?
The median price is $22.99; half of the best sellers are priced between $15.90 and $30.
Can new books break into Reference?
9% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.